1 files changed, 1 insertions, 1 deletions
diff --git a/src/Document.h b/src/Document.h
index 3eeeef029..de986ce2a 100644
--- a/src/Document.h
+++ b/src/Document.h
@@ -164,7 +164,7 @@ public:
 	bool isEnabled;
 };
 
-inline int LevelNumber(int level) noexcept {
+constexpr int LevelNumber(int level) noexcept {
 	return level & SC_FOLDLEVELNUMBERMASK;
 }