diff --git a/src/p_setup.c b/src/p_setup.c
index 87a1739..e737479 100644
--- a/src/p_setup.c
+++ b/src/p_setup.c
@@ -19,6 +19,7 @@
 //	set up initial state and misc. LUTs.
 //
 
+#include <limits.h>
 #include <stdint.h>
 #include <stdlib.h>
 #include <math.h>