diff --git a/sim_video.c b/sim_video.c
index d1475fb9..fe4e72f9 100644
--- a/sim_video.c
+++ b/sim_video.c
@@ -2159,7 +2159,7 @@ if (!vid_active) {
     return SCPE_UDIS | SCPE_NOMESSAGE;
     }
 fullname = (char *)malloc (strlen(filename) + 5);
-if (!filename)
+if (!fullname)
     return SCPE_MEM;
 #if SDL_MAJOR_VERSION == 1
 #if defined(HAVE_LIBPNG)