diff --git a/dlls/kernel32/tests/debugger.c b/dlls/kernel32/tests/debugger.c
index 706ca24c95d47416ac8d39226f84c1252b9dbcf6..6245d60f142a6c29d15462f3400e85ad384a4fc5 100644
--- a/dlls/kernel32/tests/debugger.c
+++ b/dlls/kernel32/tests/debugger.c
@@ -131,7 +131,7 @@ static void doDebugger(int argc, char** argv)
 {
     const char* logfile;
     debugger_blackbox_t blackbox;
-    HANDLE start_event, done_event, debug_event;
+    HANDLE start_event = 0, done_event = 0, debug_event;
 
     blackbox.argc=argc;
     logfile=(argc >= 4 ? argv[3] : NULL);