diff --git a/libs/pbd/reallocpool.cc b/libs/pbd/reallocpool.cc
index 8a57451fa5..84d1846f35 100644
--- a/libs/pbd/reallocpool.cc
+++ b/libs/pbd/reallocpool.cc
@@ -32,7 +32,7 @@
 #define ASSERT assert
 #else
 #define STATS_segment
-#define ASSERT
+#define ASSERT(exp)
 #endif
 
 #ifdef RAP_WITH_CALL_STATS