diff --git a/include/lib/util_time.h b/include/lib/util_time.h
index 42b9741a..21e2d78e 100644
--- a/include/lib/util_time.h
+++ b/include/lib/util_time.h
@@ -19,6 +19,8 @@
 
 #define MSEC_PER_SEC	1000L
 
+#define SEC_PER_DAY	(24 * 60 * 60)
+
 /**
  * Convert nanoseconds to microseconds
  *
diff --git a/zpcimon/zpcimon.c b/zpcimon/zpcimon.c
index 98a2871a..40b6edd7 100644
--- a/zpcimon/zpcimon.c
+++ b/zpcimon/zpcimon.c
@@ -24,6 +24,7 @@
 #include "lib/util_opt.h"
 #include "lib/util_fmt.h"
 #include "lib/util_libc.h"
+#include "lib/util_time.h"
 
 #include <openssl/evp.h>
 
@@ -102,7 +103,7 @@ static void parse_cmdline(int argc, char *argv[], struct options *opts)
 					optarg);
 				exit(EXIT_FAILURE);
 			}
-			if (seconds < 86400)
+			if (seconds < SEC_PER_DAY)
 				opts->interval_seconds = seconds;
 			if (seconds < 1)
 				opts->interval_seconds = 1;