diff --git a/Makefile b/Makefile
index 2002d7ff..16de4515 100644
--- a/Makefile
+++ b/Makefile
@@ -122,6 +122,12 @@ test: $(TESTFILES) $(CYCLONE)
 tags:
 	ctags -R *
 
+.PHONY: indent
+indent:
+	indent -linux -l80 -i2 -nut gc.c
+	indent -linux -l80 -i2 -nut runtime.c
+	indent -linux -l80 -i2 -nut include/cyclone/*.h
+
 .PHONY: clean
 clean:
 	rm -rf a.out *.o *.so *.a *.out tags cyclone icyc scheme/*.o scheme/*.c scheme/*.meta srfi/*.c srfi/*.meta srfi/*.o scheme/cyclone/*.o scheme/cyclone/*.c scheme/cyclone/*.meta cyclone.c dispatch.c icyc.c generate-c.c generate-c