diff --git a/Makefile b/Makefile
index 91e6b00..55cb555 100644
--- a/Makefile
+++ b/Makefile
@@ -1,9 +1,19 @@
+EMACS ?= emacs
+# Handle the mess when inside Emacs.
+unexport INSIDE_EMACS		#cask not like this.
+ifeq ($(EMACS), t)
+EMACS = emacs
+endif
+
+emacs = $(EMACS)
 
 all: package
 
+byte-compile:
+	cask exec $(emacs) --batch -L lisp -f batch-byte-compile *.el
+
 package:
 	cask package
 clean:
 	rm -rf dist
 	rm -f -- *.elc
-