diff --git a/magick/utility.c b/magick/utility.c
index ce06169..62c8006 100644
--- a/magick/utility.c
+++ b/magick/utility.c
@@ -824,7 +824,7 @@
       filelist[j]=DestroyString(filelist[j]);
       if (strlen(filename) >= MaxTextExtent)
         ThrowFatalException(OptionFatalError,"FilenameTruncated");
-      if (IsPathDirectory(filename) == 0)
+      if (IsPathDirectory(filename) <= 0)
         {
           char
             path[MaxTextExtent];