diff --git a/src/ReplayGainInfo.hxx b/src/ReplayGainInfo.hxx
index 37815c933..33bef36be 100644
--- a/src/ReplayGainInfo.hxx
+++ b/src/ReplayGainInfo.hxx
@@ -39,8 +39,7 @@ struct ReplayGainTuple {
 		peak = 0.0;
 	}
 
-	gcc_pure
-	bool IsDefined() const {
+	constexpr bool IsDefined() const {
 		return gain > -100;
 	}