diff --git a/clients/synth/lash.c b/clients/synth/lash.c
index 03717ae..5395198 100644
--- a/clients/synth/lash.c
+++ b/clients/synth/lash.c
@@ -22,6 +22,7 @@
 
 #include "config.h"
 
+#include <string.h>
 #include <unistd.h>
 
 #include <lash/lash.h>