diff --git a/uri.c b/uri.c
index ef9ca12..5f77837 100644
--- a/uri.c
+++ b/uri.c
@@ -874,7 +874,7 @@
     if (str == NULL)
 	return(NULL);
     len = xmlStrlen(str);
-    if (len <= 0) return(NULL);
+    if (!(len > 0)) return(NULL);
 
     len += 20;
     ret = (xmlChar *) xmlMalloc(len);