diff --git a/libs/libc/wchar/lib_mbsnrtowcs.c b/libs/libc/wchar/lib_mbsnrtowcs.c
index 4bd5ecf23a..b1f133f923 100644
--- a/libs/libc/wchar/lib_mbsnrtowcs.c
+++ b/libs/libc/wchar/lib_mbsnrtowcs.c
@@ -38,6 +38,7 @@
  ****************************************************************************/
 
 #include <sys/types.h>
+#include <string.h>
 #include <wchar.h>
 
 #ifdef CONFIG_LIBC_WCHAR