diff --git a/bin/compile b/bin/compile
index 0f36590..bf7fb18 100755
--- a/bin/compile
+++ b/bin/compile
@@ -11,7 +11,10 @@ CACHE_DIR=$2
 CACHED_DIRS=".heroku"
 WORKING_DIR=$(pwd)
 
-rm -fr $CACHE_DIR
+# If PLATFORM is undefined or defined as HEROKU then remove cache directory.
+if [[ "${PLATFORM:-HEROKU}" == "HEROKU" ]]; then
+    rm -fr $CACHE_DIR
+fi
 mkdir -p $CACHE_DIR
 
 # Versions.
@@ -101,4 +104,3 @@ fi
 
 cp $ROOT_DIR/conf/mime.types $BUILD_DIR/
 cp $BIN_DIR/launch-nginx "$BUILD_DIR/local/sbin"
-