diff --git a/tools/versioner/src/Preprocessor.cpp b/tools/versioner/src/Preprocessor.cpp
index 8d0b943..3c86486 100644
--- a/tools/versioner/src/Preprocessor.cpp
+++ b/tools/versioner/src/Preprocessor.cpp
@@ -452,6 +452,11 @@
       const Location& location = decl_it.first;
       const Declaration& decl = decl_it.second;
 
+      if (decl.no_guard) {
+        // No guard required.
+        continue;
+      }
+
       DeclarationAvailability macro_guard = calculateRequiredGuard(decl);
       if (!macro_guard.empty()) {
         guards[location.filename][location] = macro_guard;