diff --git a/src/c/compiler.d b/src/c/compiler.d
index 64da78d90..0489e7363 100644
--- a/src/c/compiler.d
+++ b/src/c/compiler.d
@@ -12,6 +12,7 @@
     See file '../Copyright' for full details.
 */
 
+#include <string.h>
 #include "ecl.h"
 #include "ecl-inl.h"
 #include "bytecodes.h"