diff --git a/Formula/chibi-scheme.rb b/Formula/chibi-scheme.rb
index ccdf169697..07bf7cae39 100644
--- a/Formula/chibi-scheme.rb
+++ b/Formula/chibi-scheme.rb
@@ -20,7 +20,7 @@ class ChibiScheme < Formula
     ENV.deparallelize
 
     # "make" and "make install" must be done separately
-    system "make"
+    system "make", "PREFIX=#{prefix}"
     system "make", "install", "PREFIX=#{prefix}"
   end