diff --git a/coders/rle.c b/coders/rle.c
index 346f790e88..dddfc4cdad 100644
--- a/coders/rle.c
+++ b/coders/rle.c
@@ -340,8 +340,8 @@ static Image *ReadRLEImage(const ImageInfo *image_info,ExceptionInfo *exception)
     */
     number_planes_filled=(number_planes % 2 == 0) ? number_planes :
       number_planes+1;
-    if ((number_pixels*number_planes_filled) !=
-        (MagickSizeType) (((size_t) number_pixels*number_planes_filled)))
+    if (HeapOverflowSanityCheckGetSize(number_planes_filled,
+         (size_t) number_pixels,(size_t *) NULL) != MagickFalse)
       ThrowRLEException(ResourceLimitError,"MemoryAllocationFailed");
     pixel_info=AcquireVirtualMemory(image->columns,image->rows*
       MagickMax(number_planes_filled,4)*sizeof(*pixels));
diff --git a/coders/sgi.c b/coders/sgi.c
index 2cbdfe527b..87ef1ae0b1 100644
--- a/coders/sgi.c
+++ b/coders/sgi.c
@@ -386,8 +386,8 @@ static Image *ReadSGIImage(const ImageInfo *image_info,ExceptionInfo *exception)
     */
     bytes_per_pixel=(size_t) iris_info.bytes_per_pixel;
     number_pixels=(MagickSizeType) iris_info.columns*iris_info.rows;
-    if ((4*bytes_per_pixel*number_pixels) !=
-        ((MagickSizeType) ((size_t) (4*bytes_per_pixel*number_pixels))))
+    if (HeapOverflowSanityCheckGetSize(4*bytes_per_pixel,(size_t) number_pixels,
+         (size_t *) NULL) != MagickFalse)
       ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
     pixel_info=AcquireVirtualMemory(iris_info.columns,iris_info.rows*4*
       bytes_per_pixel*sizeof(*pixels));