diff --git a/nexus/archdefs.h b/nexus/archdefs.h
index 4d09110594..f70b1c3199 100644
--- a/nexus/archdefs.h
+++ b/nexus/archdefs.h
@@ -111,7 +111,7 @@ struct GroupId
     int8_t x = 0, y = 0;
 
     bool operator==(const GroupId &other) const { return (type == other.type) && (x == other.x) && (y == other.y); }
-    bool operator!=(const GroupId &other) const { return (type != other.type) || (x != other.x) || (y == other.y); }
+    bool operator!=(const GroupId &other) const { return (type != other.type) || (x != other.x) || (y != other.y); }
     unsigned int hash() const { return mkhash(mkhash(x, y), int(type)); }
 };
 
diff --git a/nexus/pack.cc b/nexus/pack.cc
index b02d25c6eb..b4971d240a 100644
--- a/nexus/pack.cc
+++ b/nexus/pack.cc
@@ -1235,7 +1235,10 @@ struct NexusPacker
         base_iodelay_rules[id_DELAYB].param_xform[id_DEL_VALUE] = ctx->id("DELAY.DEL_VALUE");
         base_iodelay_rules[id_DELAYB].param_xform[id_COARSE_DELAY] = ctx->id("DELAY.COARSE_DELAY");
 
-        base_iodelay_rules[id_DELAYA] = base_iodelay_rules[id_DELAYB];
+        {
+            XFormRule delayb_copy = base_iodelay_rules.at(id_DELAYB);
+            base_iodelay_rules[id_DELAYA] = std::move(delayb_copy);
+        }
 
         base_iodelay_rules[id_DELAYA].param_xform[id_COARSE_DELAY_MODE] = ctx->id("DELAY.COARSE_DELAY_MODE");
         base_iodelay_rules[id_DELAYA].param_xform[id_EDGE_MONITOR] = ctx->id("DELAY.EDGE_MONITOR");