diff --git a/app/src/main/java/org/solovyev/android/calculator/function/FunctionParamEditText.java b/app/src/main/java/org/solovyev/android/calculator/function/FunctionParamEditText.java
deleted file mode 100644
index a64589ea..00000000
--- a/app/src/main/java/org/solovyev/android/calculator/function/FunctionParamEditText.java
+++ /dev/null
@@ -1,56 +0,0 @@
-/*
- * Copyright 2013 serso aka se.solovyev
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *    http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- * Contact details
- *
- * Email: se.solovyev@gmail.com
- * Site:  http://se.solovyev.org
- */
-
-package org.solovyev.android.calculator.function;
-
-import android.content.Context;
-import android.os.Parcelable;
-import android.util.AttributeSet;
-import android.view.AbsSavedState;
-import android.widget.EditText;
-
-public class FunctionParamEditText extends EditText {
-
-    public FunctionParamEditText(Context context) {
-        super(context);
-    }
-
-    public FunctionParamEditText(Context context, AttributeSet attrs) {
-        super(context, attrs);
-    }
-
-    public FunctionParamEditText(Context context, AttributeSet attrs, int defStyle) {
-        super(context, attrs, defStyle);
-    }
-
-    // we restore state manually outside
-    @Override
-    public Parcelable onSaveInstanceState() {
-        super.onSaveInstanceState();
-        return AbsSavedState.EMPTY_STATE;
-    }
-
-    @Override
-    public void onRestoreInstanceState(Parcelable state) {
-        super.onRestoreInstanceState(null);
-    }
-}