diff --git a/src/cacaball.c b/src/cacaball.c
index 7342665..a1f0b86 100644
--- a/src/cacaball.c
+++ b/src/cacaball.c
@@ -14,6 +14,7 @@
 #include "config.h"
 
 #if !defined(__KERNEL__)
+#   include <string.h>
 #   include <math.h>
 #   ifndef M_PI
 #       define M_PI 3.14159265358979323846