Fix thinko.

diff --git a/glretrace.py b/glretrace.py
index 87168195b20e44588cec00b2380301d69b785ea9..f809b9e9502bb0b518f1d9f2da1154e14462dad3 100644 (file)
--- a/glretrace.py
+++ b/glretrace.py
@@ -164,8 +164,8 @@ unsigned __frame = 0;
 long long __startTime = 0;
 bool __wait = false;
 
-const char *__compare_prefix = "";
-const char *__snapshot_prefix = "";
+const char *__compare_prefix = NULL;
+const char *__snapshot_prefix = NULL;
 
 
 static void