diff --git a/CBLAS/src/cblas_cgbmv.c b/CBLAS/src/cblas_cgbmv.c
index 776fcbc7e..40e7d6c2c 100644
--- a/CBLAS/src/cblas_cgbmv.c
+++ b/CBLAS/src/cblas_cgbmv.c
@@ -155,7 +155,7 @@ void API_SUFFIX(cblas_cgbmv)(const CBLAS_LAYOUT layout,
       if (TransA == CblasConjTrans)
       {
          if (x != X) free(x);
-         if (N > 0)
+         if (M > 0 && N > 0)
          {
             do
             {
diff --git a/CBLAS/src/cblas_cgemv.c b/CBLAS/src/cblas_cgemv.c
index a9a27f456..fd10780cf 100644
--- a/CBLAS/src/cblas_cgemv.c
+++ b/CBLAS/src/cblas_cgemv.c
@@ -149,7 +149,7 @@ void API_SUFFIX(cblas_cgemv)(const CBLAS_LAYOUT layout,
       if (TransA == CblasConjTrans)
       {
          if (x != (const float *)X) free(x);
-         if (N > 0)
+         if (M > 0 && N > 0)
          {
             do
             {
diff --git a/CBLAS/src/cblas_zgbmv.c b/CBLAS/src/cblas_zgbmv.c
index 6efd9be78..e23c9ce09 100644
--- a/CBLAS/src/cblas_zgbmv.c
+++ b/CBLAS/src/cblas_zgbmv.c
@@ -154,7 +154,7 @@ void API_SUFFIX(cblas_zgbmv)(const CBLAS_LAYOUT layout,
       if (TransA == CblasConjTrans)
       {
          if (x != X) free(x);
-         if (N > 0)
+         if (M > 0 && N > 0)
          {
             do
             {
diff --git a/CBLAS/src/cblas_zgemv.c b/CBLAS/src/cblas_zgemv.c
index 930f4f9cb..6f31eba75 100644
--- a/CBLAS/src/cblas_zgemv.c
+++ b/CBLAS/src/cblas_zgemv.c
@@ -152,7 +152,7 @@ void API_SUFFIX(cblas_zgemv)(const CBLAS_LAYOUT layout,
       if (TransA == CblasConjTrans)
       {
          if (x != X) free(x);
-         if (N > 0)
+         if (M > 0 && N > 0)
          {
             do
             {