diff --git a/Formula/gucharmap.rb b/Formula/gucharmap.rb
index 5cdc6d847a..0bc6a9c65a 100644
--- a/Formula/gucharmap.rb
+++ b/Formula/gucharmap.rb
@@ -15,11 +15,14 @@ class Gucharmap < Formula
   depends_on "intltool" => :build
   depends_on "itstool" => :build
   depends_on "pkg-config" => :build
+  depends_on "python" => :build
   depends_on "gtk+3"
 
   def install
+    xy = Language::Python.major_minor_version "python3"
+    ENV.append_path "PYTHONPATH", "#{Formula["libxml2"].opt_lib}/python#{xy}/site-packages"
     ENV["WGET"] = "curl"
-    ENV.append_path "PYTHONPATH", "#{Formula["libxml2"].opt_lib}/python2.7/site-packages"
+
     system "./configure", "--disable-debug",
                           "--disable-dependency-tracking",
                           "--disable-silent-rules",