diff --git a/Formula/classpy.rb b/Formula/classpy.rb
index 05324c7..8abc66c 100644
--- a/Formula/classpy.rb
+++ b/Formula/classpy.rb
@@ -7,7 +7,7 @@ class Classpy < Formula
 
   bottle :unneeded
 
-  depends_on :openjdk@8
+  depends_on "openjdk@8"
 
   def install
     prefix.install "classpy-#{version}.jar"