diff --git a/winsup/utils/cygwin-console-helper.cc b/winsup/utils/cygwin-console-helper.cc
index 8f62ed7e6..0e04f4d18 100644
--- a/winsup/utils/cygwin-console-helper.cc
+++ b/winsup/utils/cygwin-console-helper.cc
@@ -5,9 +5,9 @@ main (int argc, char **argv)
   char *end;
   if (argc != 3)
     exit (1);
-  HANDLE h = (HANDLE) strtoul (argv[1], &end, 0);
+  HANDLE h = (HANDLE) strtoull (argv[1], &end, 0);
   SetEvent (h);
-  h = (HANDLE) strtoul (argv[2], &end, 0);
+  h = (HANDLE) strtoull (argv[2], &end, 0);
   WaitForSingleObject (h, INFINITE);
   exit (0);
 }