diff --git a/project/extras.mk b/project/extras.mk
index 6d0940a..77ba7b9 100644
--- a/project/extras.mk
+++ b/project/extras.mk
@@ -1,5 +1,7 @@
 include $(PROJECT_DIR)/project/codegen.mk
 
+CFLAGS_DEBUG  += -DDEBUG_libfirm
+
 CFLAGS_COMMON += -I$(SOURCE_DIR)/include/libfirm
 CFLAGS_COMMON += -I$(SOURCE_DIR)/include/libfirm/adt