diff --git a/lib/output.c b/lib/output.c
index a0ddacf6..35389c23 100644
--- a/lib/output.c
+++ b/lib/output.c
@@ -561,7 +561,7 @@ int libwebsockets_serve_http_file(struct libwebsocket_context *context,
 	fstat(wsi->u.http.fd, &stat_buf);
 	wsi->u.http.filelen = stat_buf.st_size;
 	p += sprintf((char *)p,
-"HTTP/1.0 200 OK\x0d\x0aServer: libwebsockets\x0d\x0aContent-Type: %s\x0d\x0a",
+"HTTP/1.0 200 OK\x0d\x0aServer: libwebsockets\x0d\x0a""Content-Type: %s\x0d\x0a",
 								  content_type);
 	p += sprintf((char *)p,
 		"Content-Length: %u\x0d\x0a\x0d\x0a",