diff --git a/src/video/SDL_surface.c b/src/video/SDL_surface.c
index 173bcbbb8e..e6f13b8138 100644
--- a/src/video/SDL_surface.c
+++ b/src/video/SDL_surface.c
@@ -1939,6 +1939,7 @@ SDL_Surface *SDL_ConvertSurfaceAndColorspace(SDL_Surface *surface, SDL_PixelForm
             if (!convert->pixels) {
                 goto error;
             }
+            convert->flags &= ~SDL_SURFACE_PREALLOCATED;
             convert->pitch = surface->pitch;
             SDL_memcpy(convert->pixels, surface->pixels, size);