diff --git a/src/BulletInverseDynamics/IDConfig.hpp b/src/BulletInverseDynamics/IDConfig.hpp
index 08bbdcb70..000cdc58a 100644
--- a/src/BulletInverseDynamics/IDConfig.hpp
+++ b/src/BulletInverseDynamics/IDConfig.hpp
@@ -78,7 +78,7 @@ struct idArray {
 	typedef b3AlignedObjectArray<T> type;
 };
 typedef int idArrayIdx;
-#define ID_DECLARE_ALIGNED_ALLOCATOR B3_DECLARE_ALIGNED_ALLOCATOR
+#define ID_DECLARE_ALIGNED_ALLOCATOR() B3_DECLARE_ALIGNED_ALLOCATOR()
 
 // use bullet's allocator functions
 #define idMalloc btAllocFunc