diff --git a/src/drawing/Image.cpp b/src/drawing/Image.cpp
index bc8a879d7d..ee02e458d6 100644
--- a/src/drawing/Image.cpp
+++ b/src/drawing/Image.cpp
@@ -56,7 +56,7 @@ static bool AllocatedListContains(uint32 baseImageId, uint32 count)
 
 static uint32 AllocateImageList(uint32 count)
 {
-    Guard::Assert(count == 0, GUARD_LINE);
+    Guard::Assert(count != 0, GUARD_LINE);
 
     if (!_initialised)
     {