diff --git a/code/Makefile b/code/Makefile
index c10e91f73..6779fac27 100644
--- a/code/Makefile
+++ b/code/Makefile
@@ -10,7 +10,7 @@ CFLAGS += -O0
 CFLAGS += -Wall
 CFLAGS += -Wextra
 
-run: leak.o
+run: leak.o timing.o
 	./leak.o
 
 %.o: %.c