diff --git a/src/main/java/org/solovyev/android/calculator/math/edit/CalculatorVarsActivity.java b/src/main/java/org/solovyev/android/calculator/math/edit/CalculatorVarsActivity.java
index 8a0b7f8c..1832f96c 100644
--- a/src/main/java/org/solovyev/android/calculator/math/edit/CalculatorVarsActivity.java
+++ b/src/main/java/org/solovyev/android/calculator/math/edit/CalculatorVarsActivity.java
@@ -62,6 +62,15 @@ public class CalculatorVarsActivity extends AbstractMathEntityListActivity<ICons
 			}
 		},
 
+		remove(R.string.c_remove) {
+			@Override
+			public void doAction(@NotNull IConstant data, @NotNull Context context) {
+				if (context instanceof AbstractMathEntityListActivity) {
+					new MathEntityRemover<IConstant>(data, null, CalculatorEngine.instance.getVarsRegistry(), ((AbstractMathEntityListActivity<IConstant>) context)).showConfirmationDialog();
+				}
+			}
+		},
+
 		copy_value(R.string.c_copy_value) {
 			@Override
 			public void doAction(@NotNull IConstant data, @NotNull Context context) {
@@ -126,6 +135,7 @@ public class CalculatorVarsActivity extends AbstractMathEntityListActivity<ICons
 		
 		if ( item.isSystem() ) {
 			result.remove(LongClickMenuItem.edit);
+			result.remove(LongClickMenuItem.remove);
 		}
 		
 		if ( StringUtils.isEmpty(CalculatorEngine.instance.getVarsRegistry().getDescription(this, item.getName())) ) {
diff --git a/src/main/java/org/solovyev/android/calculator/math/edit/MathEntityRemover.java b/src/main/java/org/solovyev/android/calculator/math/edit/MathEntityRemover.java
index 07b89e90..1b9fe1cb 100644
--- a/src/main/java/org/solovyev/android/calculator/math/edit/MathEntityRemover.java
+++ b/src/main/java/org/solovyev/android/calculator/math/edit/MathEntityRemover.java
@@ -58,17 +58,7 @@ class MathEntityRemover<T extends MathEntity> implements DialogInterface.OnClick
 	@Override
 	public void onClick(DialogInterface dialog, int which) {
 		if (!confirmed) {
-			final TextView question = new TextView(activity);
-			question.setText(String.format(activity.getString(R.string.c_var_removal_confirmation_question), mathEntity.getName()));
-			question.setPadding(6, 6, 6, 6);
-			final AlertDialog.Builder builder = new AlertDialog.Builder(activity)
-					.setCancelable(true)
-					.setView(question)
-					.setTitle(R.string.c_var_removal_confirmation)
-					.setNegativeButton(R.string.c_no, callbackOnCancel)
-					.setPositiveButton(R.string.c_yes, new MathEntityRemover<T>(mathEntity, callbackOnCancel, true, varsRegistry, activity));
-
-			builder.create().show();
+			showConfirmationDialog();
 		} else {
 			if (activity.isInCategory(mathEntity)) {
 				activity.getAdapter().remove(mathEntity);
@@ -81,4 +71,18 @@ class MathEntityRemover<T extends MathEntity> implements DialogInterface.OnClick
 			}
 		}
 	}
+
+	public void showConfirmationDialog() {
+		final TextView question = new TextView(activity);
+		question.setText(String.format(activity.getString(R.string.c_var_removal_confirmation_question), mathEntity.getName()));
+		question.setPadding(6, 6, 6, 6);
+		final AlertDialog.Builder builder = new AlertDialog.Builder(activity)
+				.setCancelable(true)
+				.setView(question)
+				.setTitle(R.string.c_var_removal_confirmation)
+				.setNegativeButton(R.string.c_no, callbackOnCancel)
+				.setPositiveButton(R.string.c_yes, new MathEntityRemover<T>(mathEntity, callbackOnCancel, true, varsRegistry, activity));
+
+		builder.create().show();
+	}
 }