diff --git a/dlls/gdiplus/matrix.c b/dlls/gdiplus/matrix.c
index a8617db85a2..cf8b44be5bd 100644
--- a/dlls/gdiplus/matrix.c
+++ b/dlls/gdiplus/matrix.c
@@ -244,7 +244,7 @@ GpStatus WINGDIPAPI GdipTransformMatrixPoints(GpMatrix *matrix, GpPointF *pts,
     REAL x, y;
     INT i;
 
-    if(!matrix || !pts)
+    if(!matrix || !pts || count <= 0)
         return InvalidParameter;
 
     for(i = 0; i < count; i++)
@@ -265,6 +265,9 @@ GpStatus WINGDIPAPI GdipTransformMatrixPointsI(GpMatrix *matrix, GpPoint *pts, I
     GpStatus ret;
     INT i;
 
+    if(count <= 0)
+        return InvalidParameter;
+
     ptsF = GdipAlloc(sizeof(GpPointF) * count);
     if(!ptsF)
         return OutOfMemory;