diff --git a/source/src/rendergl.cpp b/source/src/rendergl.cpp
index 7e222ec7..c717f3c9 100644
--- a/source/src/rendergl.cpp
+++ b/source/src/rendergl.cpp
@@ -107,7 +107,7 @@ GLuint installtex(const char *texname, int &xs, int &ys, bool clamp)
         };
     };
     if(gluBuild2DMipmaps(GL_TEXTURE_2D, mode, xs, ys, mode, GL_UNSIGNED_BYTE, scaledimg)) fatal("could not build mipmaps");
-    if(xs!=s->w) delete[] scaledimg;
+    if(scaledimg != (uchar *)s->pixels) delete[] scaledimg;
     SDL_FreeSurface(s);
     return tnum;
 };