diff --git a/src/rt/memory_region.cpp b/src/rt/memory_region.cpp
index 79936949cf80..b142534a242a 100644
--- a/src/rt/memory_region.cpp
+++ b/src/rt/memory_region.cpp
@@ -4,7 +4,7 @@
 // NB: please do not commit code with this uncommented. It's
 // hugely expensive and should only be used as a last resort.
 //
-#define TRACK_ALLOCATIONS
+//#define TRACK_ALLOCATIONS
 
 #define MAGIC 0xbadc0ffe