diff --git a/mac/hid.c b/mac/hid.c
index 2f9282c..47ad049 100644
--- a/mac/hid.c
+++ b/mac/hid.c
@@ -291,10 +291,10 @@ static int get_string_property(IOHIDDeviceRef device, CFStringRef prop, wchar_t
 			&used_buf_len);
 
 		buf[chars_copied] = 0;
-		return chars_copied;
+		return 0;
 	}
 	else
-		return 0;
+		return -1;
 		
 }