diff --git a/qtest.c b/qtest.c
index 53e2b7942c..cd7186c39c 100644
--- a/qtest.c
+++ b/qtest.c
@@ -34,7 +34,7 @@ static int irq_levels[MAX_IRQ];
 static struct timeval start_time;
 static bool qtest_opened;
 
-#define FMT_timeval "%" PRId64 ".%06" PRId64
+#define FMT_timeval "%ld.%06ld"
 
 /**
  * QTest Protocol