diff --git a/newlib/libc/include/string.h b/newlib/libc/include/string.h
index 7833aa156..9c536f35f 100644
--- a/newlib/libc/include/string.h
+++ b/newlib/libc/include/string.h
@@ -121,6 +121,9 @@ size_t	 _EXFUN(strnlen,(const char *, size_t));
 #if __BSD_VISIBLE
 char 	*_EXFUN(strsep,(char **, const char *));
 #endif
+#if __BSD_VISIBLE
+char    *strnstr(const char *, const char *, size_t) __pure;
+#endif
 
 #if __MISC_VISIBLE
 char	*_EXFUN(strlwr,(char *));
diff --git a/newlib/libc/string/Makefile.am b/newlib/libc/string/Makefile.am
index e62f28627..f8bd41e08 100644
--- a/newlib/libc/string/Makefile.am
+++ b/newlib/libc/string/Makefile.am
@@ -40,6 +40,7 @@ GENERAL_SOURCES = \
 	strncmp.c \
 	strncpy.c \
 	strnlen.c \
+	strnstr.c \
 	strpbrk.c \
 	strrchr.c \
 	strsep.c \