diff --git a/midori/main.c b/midori/main.c
index 99d9e65d..fdd5edfb 100644
--- a/midori/main.c
+++ b/midori/main.c
@@ -1697,6 +1697,7 @@ main (int    argc,
     /* Parse cli options */
     webapp = NULL;
     config = NULL;
+    diagnostic_dialog = FALSE;
     run = FALSE;
     snapshot = NULL;
     execute = FALSE;