--- a/test/mtdev-test.c
+++ b/test/mtdev-test.c
@@ -38,7 +38,7 @@
 #endif
 
 /* year-proof millisecond event time */
-typedef uint64_t mstime_t;
+typedef unsigned long long mstime_t;
 
 static int use_event(const struct input_event *ev)
 {