diff --git a/Makefile b/Makefile
index 71df3af..ef2c697 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-CFLAGS = -g -Wall -Wextra -pedantic -Wno-unused-parameter
+CFLAGS = -g -O3 -Wall -Wextra -pedantic -Wno-unused-parameter
 OBJS = $(patsubst %.c, %.o, $(sort $(wildcard *.c)))
 TARGET = kuroko
 
diff --git a/kuroko.h b/kuroko.h
index 21b9f1e..89d7070 100644
--- a/kuroko.h
+++ b/kuroko.h
@@ -4,7 +4,9 @@
 #include <stddef.h>
 #include <stdlib.h>
 
+#ifdef DEBUG
 #define ENABLE_DEBUGGING
 #define ENABLE_TRACING
 #define ENABLE_SCAN_TRACING
 #define ENABLE_STRESS_GC
+#endif