diff --git a/DOCS/interface-changes/secondary-sub-scale.txt b/DOCS/interface-changes/secondary-sub-scale.txt
new file mode 100644
index 0000000000000..0ea2e659eab29
--- /dev/null
+++ b/DOCS/interface-changes/secondary-sub-scale.txt
@@ -0,0 +1 @@
+add `--secondary-sub-scale` option
diff --git a/DOCS/man/options.rst b/DOCS/man/options.rst
index d8c11bd995bcd..33ff812784920 100644
--- a/DOCS/man/options.rst
+++ b/DOCS/man/options.rst
@@ -2513,6 +2513,9 @@ Subtitles
 ``--sub-scale=<0-100>``
     Factor for the text subtitle font size (default: 1).
 
+    This affects both primary and secondary subtitles by default. Use
+    ``--secondary-sub-scale`` to override the scale for secondary subtitles.
+
     .. note::
 
         This affects ASS subtitles as well, and may lead to incorrect subtitle
@@ -2579,6 +2582,12 @@ Subtitles
     Specify the position of secondary subtitles on the screen. This is similar
     to ``--sub-pos`` but for secondary subtitles.
 
+``--secondary-sub-scale=<default|0-100>``
+    Factor for the secondary subtitle font size. The default value
+    ``default`` inherits the value of ``--sub-scale``. If ``add`` or
+    ``multiply`` is used while this is ``default``, the command starts from the
+    inherited ``--sub-scale`` value and sets an explicit value.
+
 ``--sub-speed=<0.1-10.0>``
     Multiply the subtitle event timestamps with the given value. Can be used
     to fix the playback speed for frame-based subtitle formats. Affects text
diff --git a/options/options.c b/options/options.c
index 48baef13ff731..ec37928b36de9 100644
--- a/options/options.c
+++ b/options/options.c
@@ -385,6 +385,8 @@ const struct m_sub_options mp_subtitle_shared_sub_opts = {
         {"secondary-sub-delay", OPT_FLOAT(sub_delay[1])},
         {"sub-pos", OPT_FLOAT(sub_pos[0]), M_RANGE(0.0, 150.0)},
         {"secondary-sub-pos", OPT_FLOAT(sub_pos[1]), M_RANGE(0.0, 150.0)},
+        {"secondary-sub-scale", OPT_FLOAT(secondary_sub_scale),
+            M_RANGE(0, 100), .flags = M_OPT_DEFAULT_NAN},
         {"sub-visibility", OPT_BOOL(sub_visibility[0])},
         {"secondary-sub-visibility", OPT_BOOL(sub_visibility[1])},
         {"sub-ass-override", OPT_CHOICE(ass_style_override[0],
@@ -408,6 +410,7 @@ const struct m_sub_options mp_subtitle_shared_sub_opts = {
         .sub_visibility[0] = true,
         .sub_visibility[1] = true,
         .sub_pos[0] = 100,
+        .secondary_sub_scale = NAN,
         .ass_style_override[0] = ASS_STYLE_OVERRIDE_SCALE,
         .ass_style_override[1] = ASS_STYLE_OVERRIDE_STRIP,
     },
@@ -1190,6 +1193,7 @@ static const struct MPOpts mp_default_opts = {
         "secondary-sid",
         "secondary-sub-delay",
         "secondary-sub-pos",
+        "secondary-sub-scale",
         "secondary-sub-ass-override",
         "secondary-sub-visibility",
         "ab-loop-a",
diff --git a/options/options.h b/options/options.h
index 014e41de6d27e..08d620d756623 100644
--- a/options/options.h
+++ b/options/options.h
@@ -143,6 +143,7 @@ struct mp_subtitle_shared_opts {
     float sub_pos[2];
     bool sub_visibility[2];
     int ass_style_override[2];
+    float secondary_sub_scale;
 };
 
 struct mp_osd_render_opts {
diff --git a/player/command.c b/player/command.c
index 0dea4bfc9420a..a58fbddc55918 100644
--- a/player/command.c
+++ b/player/command.c
@@ -4957,11 +4957,44 @@ static bool is_property_set(int action, void *val)
     }
 }
 
+static int handle_secondary_sub_scale_default(struct MPContext *ctx,
+                                              const char *name, int action,
+                                              void *val)
+{
+    const char *opt_name = name;
+    if (strncmp(opt_name, "options/", 8) == 0)
+        opt_name += 8;
+
+    if (strcmp(opt_name, "secondary-sub-scale") != 0 ||
+        (action != M_PROPERTY_SWITCH && action != M_PROPERTY_MULTIPLY) ||
+        !isnan(ctx->opts->subs_shared->secondary_sub_scale))
+        return M_PROPERTY_NOT_IMPLEMENTED;
+
+    struct m_config_option *opt =
+        m_config_get_co(ctx->mconfig, bstr0(opt_name));
+    if (!opt)
+        return M_PROPERTY_UNKNOWN;
+
+    float scale = ctx->opts->subs_rend->sub_scale;
+    if (action == M_PROPERTY_SWITCH) {
+        struct m_property_switch_arg *sarg = val;
+        opt->opt->type->add(opt->opt, &scale, sarg->inc, sarg->wrap);
+    } else {
+        opt->opt->type->multiply(opt->opt, &scale, *(double *)val);
+    }
+
+    if (m_config_set_option_raw(ctx->mconfig, opt, &scale, 0) < 0)
+        return M_PROPERTY_ERROR;
+    return M_PROPERTY_OK;
+}
+
 int mp_property_do(const char *name, int action, void *val,
                    struct MPContext *ctx)
 {
     struct command_ctx *cmd = ctx->command_ctx;
-    int r = m_property_do(ctx->log, cmd->properties, name, action, val, ctx);
+    int r = handle_secondary_sub_scale_default(ctx, name, action, val);
+    if (r == M_PROPERTY_NOT_IMPLEMENTED)
+        r = m_property_do(ctx->log, cmd->properties, name, action, val, ctx);
 
     if (mp_msg_test(ctx->log, MSGL_V) && is_property_set(action, val)) {
         struct m_property *property = m_property_list_find(cmd->properties, name);
@@ -5097,6 +5130,7 @@ static const struct property_osd_display {
       "${?secondary-sub-visibility==yes:visible${?secondary-sid==no: (but no secondary subtitles selected)}}"},
     {"sub-forced-events-only", "Forced sub only"},
     {"sub-scale", "Sub Scale"},
+    {"secondary-sub-scale", "Secondary Sub Scale"},
     {"sub-ass-use-video-data", "Subtitle using video properties"},
     {"sub-ass-video-aspect-override", "Subtitle aspect override"},
     {"sub-ass-override", "ASS subtitle style override"},
diff --git a/sub/sd_ass.c b/sub/sd_ass.c
index 50d900e490eeb..f4d63622370b1 100644
--- a/sub/sd_ass.c
+++ b/sub/sd_ass.c
@@ -539,6 +539,10 @@ static void configure_ass(struct sd *sd, struct mp_osd_res *dim,
     bool set_scale_with_window = false;
     bool set_scale_by_window = true;
     bool total_override = false;
+    float sub_scale = opts->sub_scale;
+    if (sd->order == 1 && !isnan(shared_opts->secondary_sub_scale))
+        sub_scale = shared_opts->secondary_sub_scale;
+
     // With forced overrides, apply the --sub-* specific options
     if (converted || shared_opts->ass_style_override[sd->order] == ASS_STYLE_OVERRIDE_FORCE) {
         set_scale_with_window = opts->sub_scale_with_window;
@@ -555,7 +559,7 @@ static void configure_ass(struct sd *sd, struct mp_osd_res *dim,
         set_hinting = opts->sub_hinting;
     }
     if (total_override || shared_opts->ass_style_override[sd->order] == ASS_STYLE_OVERRIDE_SCALE) {
-        set_font_scale = opts->sub_scale;
+        set_font_scale = sub_scale;
     }
     if (set_scale_with_window) {
         set_font_scale *= dim->h / MPMAX(get_libass_scale_height(dim, set_use_margins), 1);
diff --git a/sub/sd_lavc.c b/sub/sd_lavc.c
index 5cbc6d0a21257..442dcb1593636 100644
--- a/sub/sd_lavc.c
+++ b/sub/sd_lavc.c
@@ -526,11 +526,15 @@ static struct sub_bitmaps *get_bitmaps(struct sd *sd, struct mp_osd_res d,
 
     osd_rescale_bitmaps(res, w, h, d, video_par);
 
-    if (opts->sub_scale != 1.0 && shared_opts->ass_style_override[sd->order]) {
+    float sub_scale = opts->sub_scale;
+    if (sd->order == 1 && !isnan(shared_opts->secondary_sub_scale))
+        sub_scale = shared_opts->secondary_sub_scale;
+
+    if (sub_scale != 1.0 && shared_opts->ass_style_override[sd->order]) {
         for (int n = 0; n < res->num_parts; n++) {
             struct sub_bitmap *sub = &res->parts[n];
 
-            float shit = (opts->sub_scale - 1.0f) / 2;
+            float shit = (sub_scale - 1.0f) / 2;
 
             // Fortunately VO isn't supposed to give a FUCKING FUCK about
             // whether the sub might e.g. go outside of the screen.
diff --git a/test/libmpv_test_options.c b/test/libmpv_test_options.c
index 806663854838d..0c17244a26fc2 100644
--- a/test/libmpv_test_options.c
+++ b/test/libmpv_test_options.c
@@ -114,6 +114,46 @@ static void test_options_and_properties(void)
         fail("Node: expected 1 but got %d'!\n", result_node.u.flag);
 }
 
+static void test_secondary_sub_scale(void)
+{
+    check_string("secondary-sub-scale", "default");
+
+    double sub_scale = 1.25;
+    set_option_or_property("sub-scale", MPV_FORMAT_DOUBLE, &sub_scale, false);
+
+    command_string("add secondary-sub-scale 0.25");
+    check_double("secondary-sub-scale", 1.5);
+
+    set_property_string("secondary-sub-scale", "default");
+    check_string("secondary-sub-scale", "default");
+
+    command_string("multiply secondary-sub-scale 2");
+    check_double("secondary-sub-scale", 2.5);
+
+    set_property_string("secondary-sub-scale", "default");
+    check_string("secondary-sub-scale", "default");
+
+    command_string("add options/secondary-sub-scale 0.25");
+    check_double("secondary-sub-scale", 1.5);
+
+    set_property_string("secondary-sub-scale", "default");
+    check_string("secondary-sub-scale", "default");
+
+    command_string("multiply options/secondary-sub-scale 2");
+    check_double("secondary-sub-scale", 2.5);
+
+    set_property_string("secondary-sub-scale", "default");
+    check_string("secondary-sub-scale", "default");
+
+    double secondary_sub_scale = 0.5;
+    set_option_or_property("secondary-sub-scale", MPV_FORMAT_DOUBLE,
+                           &secondary_sub_scale, false);
+    check_double("secondary-sub-scale", secondary_sub_scale);
+
+    set_property_string("secondary-sub-scale", "default");
+    check_string("secondary-sub-scale", "default");
+}
+
 int main(int argc, char *argv[])
 {
     if (argc != 1)
@@ -130,6 +170,8 @@ int main(int argc, char *argv[])
     const char *fmt = "================ TEST: %s ================\n";
     printf(fmt, "test_options_and_properties");
     test_options_and_properties();
+    printf(fmt, "test_secondary_sub_scale");
+    test_secondary_sub_scale();
     printf("================ SHUTDOWN ================\n");
 
     command_string("quit");