diff --git a/lib/tokenize.cpp b/lib/tokenize.cpp
index 8dd6c585e..dc6438bdb 100644
--- a/lib/tokenize.cpp
+++ b/lib/tokenize.cpp
@@ -8006,6 +8006,8 @@ static bool isNonMacro(const Token* tok)
         return true;
     if (tok->str().compare(0, 2, "__") == 0) // attribute/annotation
         return true;
+    if (Token::simpleMatch(tok, "alignas ("))
+        return true;
     return false;
 }
 
diff --git a/test/testtokenize.cpp b/test/testtokenize.cpp
index 1bf9ed682..767021a81 100644
--- a/test/testtokenize.cpp
+++ b/test/testtokenize.cpp
@@ -6770,6 +6770,8 @@ private:
 
         const char code11[] = "struct B { B(B&&) noexcept {} ~B() noexcept {} };";
         ASSERT_NO_THROW(tokenizeAndStringify(code11));
+
+        ASSERT_NO_THROW(tokenizeAndStringify("alignas(8) alignas(16) int x;")); // alignas is not unknown macro
     }
 
     void findGarbageCode() { // Test Tokenizer::findGarbageCode()