diff --git a/src/spicy/spicyz/config.h.in b/src/spicy/spicyz/config.h.in
index 80a6c2f31d..351fc88daf 100644
--- a/src/spicy/spicyz/config.h.in
+++ b/src/spicy/spicyz/config.h.in
@@ -2,6 +2,7 @@
 
 #pragma once
 
+#include <cstring>
 #include <string>
 
 #include <hilti/rt/filesystem.h>