diff --git a/tests/ChunkedEncoding.cpp b/tests/ChunkedEncoding.cpp
index 1e70d25..4fdb4b4 100644
--- a/tests/ChunkedEncoding.cpp
+++ b/tests/ChunkedEncoding.cpp
@@ -60,7 +60,7 @@ void runTest(unsigned int maxConsume) {
                 std::abort();
             }
 
-            if (chunks[chunkOffset].starts_with(chunk)) {
+            if (chunks[chunkOffset].substr(0, chunk.length()) == chunk /*starts_with(chunk)*/) {
                 chunks[chunkOffset].remove_prefix(chunk.length());
                 if (!chunks[chunkOffset].length()) {
                     chunkOffset++;
diff --git a/tests/Makefile b/tests/Makefile
index 6e5655a..f34b68d 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -1,5 +1,5 @@
 default:
-	$(CXX) -std=c++20 -fsanitize=address -g ChunkedEncoding.cpp -o ChunkedEncoding
+	$(CXX) -std=c++17 -fsanitize=address ChunkedEncoding.cpp -o ChunkedEncoding
 	./ChunkedEncoding
 	$(CXX) -std=c++17 -fsanitize=address TopicTree.cpp -o TopicTree
 	./TopicTree