diff --git a/include/bx/error.h b/include/bx/error.h
index d18884a..66132a9 100644
--- a/include/bx/error.h
+++ b/include/bx/error.h
@@ -7,6 +7,7 @@
 #define BX_ERROR_H_HEADER_GUARD
 
 #include "bx.h"
+#include "string.h"
 
 #define BX_ERROR_SET(_ptr, _result, _msg) \
 			BX_MACRO_BLOCK_BEGIN \