diff --git a/miditones.c b/miditones.c
index 5f45234..a3228e7 100644
--- a/miditones.c
+++ b/miditones.c
@@ -534,6 +534,7 @@ output queue entries at the oldest time
 #include <stdbool.h>
 #include <time.h>
 #include <inttypes.h>
+#include <limits.h>
 typedef unsigned char byte;
 typedef uint32_t timestamp;  // see note about this in the queuing routines