diff --git a/vendor/hlslparser/src/HLSLParser.cpp b/vendor/hlslparser/src/HLSLParser.cpp
index 6b798d5617..03ba4d92a6 100644
--- a/vendor/hlslparser/src/HLSLParser.cpp
+++ b/vendor/hlslparser/src/HLSLParser.cpp
@@ -3614,7 +3614,7 @@ bool HLSLParser::ApplyPreprocessor(const char* fileName, const char* buffer, siz
     isCodeActive.push(true);
     m_tokenizer = HLSLTokenizer(fileName, buffer, length);
     sourcePreprocessed.clear();
-    while (m_tokenizer.GetToken() != HLSLToken_EndOfStream)
+    while (m_tokenizer.GetToken() != HLSLToken_EndOfStream && !isCodeActive.empty())
     {
         bool addOriginalSource = true;