diff --git a/parse.c b/parse.c
index 886bde6..81ffb74 100644
--- a/parse.c
+++ b/parse.c
@@ -267,6 +267,9 @@
 			return 1;
 		}
 
+		if (o->neg)
+			il = !il;
+
 		if (fn)
 			ret = fn(data, &il);
 		else {