diff --git a/lib/libfetch/common.c b/lib/libfetch/common.c
--- a/lib/libfetch/common.c
+++ b/lib/libfetch/common.c
@@ -456,7 +456,7 @@
 		goto fail;
 	}
 	*ptr++ = strlen(host);
-	strncpy(ptr, host, strlen(host));
+	memcpy(ptr, host, strlen(host));
 	ptr = ptr + strlen(host);
 
 	port = htons(port);