diff --git a/Makefile b/Makefile
index 17539a3..31ef0e4 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,5 @@
 calculator: main.o eval.o
+	mkdir build
 	gcc -o build/calculator src/main.o src/eval.o
 	rm src/main.o src/eval.o