diff --git a/sencha-workspace/packages/slate-cbl-baxter/package.json b/sencha-workspace/packages/slate-cbl-baxter/package.json
index a1d52a4..cb5c180 100644
--- a/sencha-workspace/packages/slate-cbl-baxter/package.json
+++ b/sencha-workspace/packages/slate-cbl-baxter/package.json
@@ -87,7 +87,16 @@
         /**
          * Controls the output directory.
          */
-        "output": "${package.dir}/build",
+         "output": {
+            "base": "${package.dir}/build",
+            "js": {
+                "version": "ES6"
+            }
+        },
+
+        "compressor": {
+            "polyfills": "none"
+        },
 
         /**
          * Indicates whether this is a locally developed package or downloaded form a repository.
diff --git a/update-build.sh b/update-build.sh
index ac716b8..06308b0 100755
--- a/update-build.sh
+++ b/update-build.sh
@@ -64,7 +64,7 @@ BUILD_PATH=`cd "$BUILD_PATH"; pwd`
 echo "Building package: $PACKAGE_PATH"
 cd "$PACKAGE_PATH"
 
-if sencha ant -Dcompressor.polyfills=none build ; then
+if sencha ant build ; then
     echo "Committing build"
 
     git add -f --all $BUILD_PATH