diff --git a/src/servers/app/BitmapDrawingEngine.cpp b/src/servers/app/BitmapDrawingEngine.cpp
index 6927842b50..14bcd31814 100644
--- a/src/servers/app/BitmapDrawingEngine.cpp
+++ b/src/servers/app/BitmapDrawingEngine.cpp
@@ -18,6 +18,7 @@ BitmapDrawingEngine::~BitmapDrawingEngine()
 }
 
 
+#if DEBUG
 bool
 BitmapDrawingEngine::IsParallelAccessLocked() const
 {
@@ -25,7 +26,7 @@ BitmapDrawingEngine::IsParallelAccessLocked() const
 	// attached to, so we never need to be locked.
 	return true;
 }
-
+#endif
 
 bool
 BitmapDrawingEngine::IsExclusiveAccessLocked() const