1 files changed, 1 insertions, 1 deletions
diff --git a/magic.py b/magic.py
index d027157..bd9d6b4 100644
--- a/magic.py
+++ b/magic.py
@@ -200,7 +200,7 @@ def errorcheck_null(result, func, args):
 
 
 def errorcheck_negative_one(result, func, args):
-    if result is -1:
+    if result == -1:
         err = magic_error(args[0])
         raise MagicException(err)
     else: