--- a/timertest.c
+++ b/timertest.c
@@ -38,6 +38,15 @@
 #include <dahdi/user.h>
 #include "dahdi_tools_version.h"
 
+#ifndef TIME_T_INT_FMT
+#ifdef __USE_TIME_BITS64
+#include <inttypes.h>
+#define TIME_T_INT_FMT PRId64
+#else
+#define TIME_T_INT_FMT "ld"
+#endif
+#endif
+
 int main(int argc, char *argv[])
 {
 	int fd;
@@ -72,7 +81,7 @@ int main(int argc, char *argv[])
 			exit(1);
 		}
 		gettimeofday(&now, NULL);
-		printf("Timer Expired (%ld ms)!\n", (now.tv_sec - orig.tv_sec) * 1000 + (now.tv_usec - orig.tv_usec) / 1000);
+		printf("Timer Expired (%" TIME_T_INT_FMT " ms)!\n", (now.tv_sec - orig.tv_sec) * 1000 + (now.tv_usec - orig.tv_usec) / 1000);
 	}
 	exit(0);
 }