diff --git a/mozilla/config/config.mk b/mozilla/config/config.mk
index 6f8cff49713..1e80e605000 100644
--- a/mozilla/config/config.mk
+++ b/mozilla/config/config.mk
@@ -451,6 +451,14 @@ PROF_FLAGS	= $(OS_GPROF_FLAGS) -DMOZILLA_GPROF
 endif
 endif
 
+ifdef FORCE_BUILD_REFCNT_LOGGING
+DEFINES	+= -DFORCE_BUILD_REFCNT_LOGGING
+endif
+
+ifdef NO_BUILD_REFCNT_LOGGING
+DEFINES += -DNO_BUILD_REFCNT_LOGGING
+endif
+
 ######################################################################
 
 GARBAGE		+= $(DEPENDENCIES) $(MKDEPENDENCIES) $(MKDEPENDENCIES).bak core $(wildcard core.[0-9]*) $(wildcard *.err) $(wildcard *.pure) $(wildcard *_pure_*.o) Templates.DB