diff --git a/src/Makefile b/src/Makefile
index 939101f..9c109ec 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -1,5 +1,5 @@
 all:
-	ocamlbuild -no-links -classic-display -tags debug,annot calc.native
+	ocamlbuild -no-links -classic-display -tags debug,annot main.native
 
 clean:
 	rm -r _build
diff --git a/src/calc.ml b/src/main.ml
similarity index 100%
rename from src/calc.ml
rename to src/main.ml