diff --git a/tcp_roccet.c b/tcp_roccet.c
index a2ccdcd..2bc4419 100644
--- a/tcp_roccet.c
+++ b/tcp_roccet.c
@@ -65,7 +65,7 @@
 #define ROCCET_ALPHA_TIMES_100 20
 
 /* min RTT probe period in ms */
-#define ROCCET_NEXT_MIN_RTT_PROBE 5000
+#define ROCCET_NEXT_MIN_RTT_PROBE_MS 5000
 
 /* The maximum interval length of a min RTT probe
  * (and consequently also the max interval for the refill).