diff --git a/test-server/test-client.c b/test-server/test-client.c
index d25e31f4..7b32cb1f 100644
--- a/test-server/test-client.c
+++ b/test-server/test-client.c
@@ -90,6 +90,10 @@ callback_dumb_increment(struct libwebsocket_context *this,
 			fprintf(stderr, "denied deflate-stream extension\n");
 			return 1;
 		}
+		if ((strcmp(in, "deflate-frame") == 0) && deny_deflate) {
+			fprintf(stderr, "denied deflate-frame extension\n");
+			return 1;
+		}
 		if ((strcmp(in, "x-google-mux") == 0) && deny_mux) {
 			fprintf(stderr, "denied x-google-mux extension\n");
 			return 1;