diff --git a/libstroke/stroke.c b/libstroke/stroke.c
index 4fccd01..2afe9bb 100644
--- a/libstroke/stroke.c
+++ b/libstroke/stroke.c
@@ -11,6 +11,7 @@
 #include <unistd.h>
 #include <stdlib.h>
 #include <stdio.h>
+#include <string.h>
 #include <math.h>
 
 #ifdef STROKE_MOUSE_FOOTPRINTS