diff --git a/win32ss/gdi/eng/alphablend.c b/win32ss/gdi/eng/alphablend.c
index 869698989ba..012d8c984be 100644
--- a/win32ss/gdi/eng/alphablend.c
+++ b/win32ss/gdi/eng/alphablend.c
@@ -111,6 +111,7 @@ EngAlphaBlend(
 
     if (!IntEngEnter(&EnterLeaveDest, psoDest, &OutputRect, FALSE, &Translate, &OutputObj))
     {
+        IntEngLeave(&EnterLeaveSource);
         return FALSE;
     }
     OutputRect.left += Translate.x;