diff --git a/project/common.mk b/project/common.mk
index 7231fba..cccf281 100644
--- a/project/common.mk
+++ b/project/common.mk
@@ -8,6 +8,7 @@ API_SRCS = \
 	src/u16_wcsspn.c \
 	src/u16_wcscspn.c \
 	src/u16_wcscmp.c \
+	src/u16_wcsncmp.c \
 
 INTERNAL_SRCS = \
 
diff --git a/src/u16_wcsncmp.c b/src/u16_wcsncmp.c
new file mode 100644
index 0000000..66bbcb5
--- /dev/null
+++ b/src/u16_wcsncmp.c
@@ -0,0 +1,24 @@
+/*******************************************************************/
+/*  u16ports: u16 variants of wide character string functions.     */
+/*  Copyright (C) 2017  Z. Gilboa                                  */
+/*  Released under the Standard MIT License; see COPYING.U16PORTS. */
+/*******************************************************************/
+
+#include <stdint.h>
+#include <u16ports/u16ports.h>
+
+int u16_wcsncmp(const uint16_t * src, const uint16_t * dst, size_t len)
+{
+	const uint16_t * lch;
+	const uint16_t * rch;
+	const uint16_t * cap;
+
+	cap = src + len;
+	lch = src;
+	rch = dst;
+
+	for (; lch<cap && *lch && *rch && *lch==*rch; lch++, rch++)
+		(void)0;
+
+	return (lch == cap) ? 0 : *lch - *rch;
+}