diff --git a/build.tools.nix b/build.tools.nix
index a49ac36..1aa25b8 100644
--- a/build.tools.nix
+++ b/build.tools.nix
@@ -7,8 +7,8 @@ let
   version = "0.8.2";
   full-name = "${base-name}-${version}.jar";
   cljdeps = callPackage ./deps.nix { };
-  classpath = cljdeps.makeClasspaths { };
-  dep-jars = splitString ":" classpath;
+  tools-classpath = cljdeps.makeClasspaths { };
+  dep-jars = splitString ":" tools-classpath;
   extract-jar = jar: "jar -xf ${jar}";
 
   manifest = writeText "MANIFEST.MF" ''
@@ -18,8 +18,8 @@ let
 
   pthru = o: builtins.trace o o;
 
-  java-compile = ns:
-    ''java -cp .:${./src}:${classpath} clojure.main -e "(compile ${ns})"'';
+  java-compile = classpath: ns:
+    ''java -cp .:${classpath} clojure.main -e "(compile ${ns})"'';
   head-or-null = lst: if (lst == [ ]) then null else head lst;
   matches-ext = ext: filename: type:
     (builtins.match ".+[.]${ext}$" filename) != null;
@@ -41,9 +41,10 @@ in stdenv.mkDerivation {
   buildPhase = ''
     mkdir classes
     HOME=.
+    cp ${./src}/build.clj .
     ${concatStringsSep "\n" (map extract-jar dep-jars)}
-    ${concatStringsSep "\n" (map java-compile all-namespaces)}
-    ${java-compile "'build"}
+    ${concatStringsSep "\n"
+    (map (java-compile tools-classpath) (all-namespaces ++ [ "'build" ]))}
     jar cmf ${manifest} ./out.jar -C . cljs cognitect com javax mozilla plugin.xml about.html clojure cognitect_aws_http.edn data_readers.cljc licenses org
   '';