diff --git a/plugins/pushes/harmony/config.rb b/plugins/pushes/harmony/config.rb
index d9890079e..6698cadec 100644
--- a/plugins/pushes/harmony/config.rb
+++ b/plugins/pushes/harmony/config.rb
@@ -72,7 +72,7 @@ module VagrantPlugins
       def validate(machine)
         errors = _detected_errors
 
-        if @app == nil || @app == ""
+        if @app.to_s.strip.empty?
           errors << I18n.t("push_harmony.errors.config.app_required")
         end
 
diff --git a/test/unit/plugins/pushes/harmony/config_test.rb b/test/unit/plugins/pushes/harmony/config_test.rb
index 0806156e3..17cd4c1fe 100644
--- a/test/unit/plugins/pushes/harmony/config_test.rb
+++ b/test/unit/plugins/pushes/harmony/config_test.rb
@@ -50,6 +50,12 @@ describe VagrantPlugins::HarmonyPush::Config do
       assert_invalid
     end
 
+    it "is invalid if blank" do
+      subject.app = "   "
+      subject.finalize!
+      assert_invalid
+    end
+
     it "is valid if set" do
       subject.app = "foo/bar"
       subject.finalize!