diff --git a/musl_src.gni b/musl_src.gni
index a298e06f63a3518b7b8b3032f6f12d00ebfe9a92..68987ebdbf60bc8a18bc64af5354a48fd0bfc3ca 100644
--- a/musl_src.gni
+++ b/musl_src.gni
@@ -2207,6 +2207,7 @@ musl_src_porting_file = [
   "src/env/getenv.c",
   "src/string/strcasecmp.c",
   "src/string/strncasecmp.c",
+  "src/string/strncat.c",
   "src/string/stpncpy.c",
   "src/string/strncpy.c",
   "src/string/strcspn.c",
diff --git a/porting/linux/user/src/string/strncat.c b/porting/linux/user/src/string/strncat.c
new file mode 100644
index 0000000000000000000000000000000000000000..01fc0a022b4384417cc5e7d1af460e56fa66905d
--- /dev/null
+++ b/porting/linux/user/src/string/strncat.c
@@ -0,0 +1,10 @@
+#include <string.h>
+
+char *strncat(char *restrict d, const char *restrict s, size_t n)
+{
+	char *a = d;
+	while (*d != 0) d++;
+	while (n && *s) n--, *d++ = *s++;
+	*d++ = 0;
+	return a;
+}