diff --git a/src/video/SDL_surface.c b/src/video/SDL_surface.c
index 1b2ee6cea..c17f23158 100644
--- a/src/video/SDL_surface.c
+++ b/src/video/SDL_surface.c
@@ -669,6 +669,8 @@ SDL_UpperBlit(SDL_Surface * src, const SDL_Rect * srcrect,
 
         dx = clip->x - dstrect->x;
         if (dx > 0) {
+            if (w < INT32_MIN + dx)
+                printf("overflow 1\n");
             w -= dx;
             dstrect->x += dx;
             srcx += dx;
@@ -679,6 +681,8 @@ SDL_UpperBlit(SDL_Surface * src, const SDL_Rect * srcrect,
 
         dy = clip->y - dstrect->y;
         if (dy > 0) {
+            if (h < INT32_MIN + dy)
+                printf("overflow 2\n");
             h -= dy;
             dstrect->y += dy;
             srcy += dy;