diff --git a/make/defs.mk b/make/defs.mk
index 826a61b9..f1d9b637 100644
--- a/make/defs.mk
+++ b/make/defs.mk
@@ -210,6 +210,11 @@ CPP        = $(YAMD)g++
 RM         = rm
 AR         = ar
 
+ifeq ($(LOG_THREAD_NAMES), true)
+CFLAGS    += -DSLOG_THREAD_NAMES
+CPPFLAGS  += -DSLOG_THREAD_NAMES
+endif
+
 ifneq ($(wildcard $(MODDIR)/devutil/scripts),)
 MOD_SCRIPT_DIR = $(MODDIR)/devutil/scripts
 else