diff --git a/planner.c b/planner.c
index be6986679..58b230a56 100644
--- a/planner.c
+++ b/planner.c
@@ -14,7 +14,7 @@
 #include "gettext.h"
 #include "libdivecomputer/parser.h"
 
-#define TIMESTEP 3 /* second */
+#define TIMESTEP 2 /* second */
 #define DECOTIMESTEP 60 /* seconds. Unit of deco stop times */
 
 int decostoplevels[] = { 0, 3000, 6000, 9000, 12000, 15000, 18000, 21000, 24000, 27000,