diff --git a/LogarithmPlotter/qml/eu/ad5001/LogarithmPlotter/js/lib/expr-eval/expression.mjs b/LogarithmPlotter/qml/eu/ad5001/LogarithmPlotter/js/lib/expr-eval/expression.mjs
index d7aba35..57b4e0e 100644
--- a/LogarithmPlotter/qml/eu/ad5001/LogarithmPlotter/js/lib/expr-eval/expression.mjs
+++ b/LogarithmPlotter/qml/eu/ad5001/LogarithmPlotter/js/lib/expr-eval/expression.mjs
@@ -146,7 +146,7 @@ function substitute(tokens, variable, expr) {
 /**
  * Evaluates the given instructions for a given Expression with given values.
  * @param {Instruction[]} tokens
- * @param {Expression} expr
+ * @param {ExprEvalExpression} expr
  * @param {Record.<string, number>} values
  * @return {number}
  */
@@ -442,7 +442,7 @@ function getSymbols(tokens, symbols, options) {
     }
 }
 
-export class Expression {
+export class ExprEvalExpression {
     /**
      * @param {Instruction[]} tokens
      * @param {Parser} parser
@@ -458,26 +458,26 @@ export class Expression {
 
     /**
      * Simplifies the expression.
-     * @param {Object<string, number|Expression>|undefined} values
-     * @returns {Expression}
+     * @param {Object<string, number|ExprEvalExpression>|undefined} values
+     * @returns {ExprEvalExpression}
      */
     simplify(values) {
         values = values || {}
-        return new Expression(simplify(this.tokens, this.unaryOps, this.binaryOps, this.ternaryOps, values), this.parser)
+        return new ExprEvalExpression(simplify(this.tokens, this.unaryOps, this.binaryOps, this.ternaryOps, values), this.parser)
     }
 
     /**
      * Creates a new expression where the variable is substituted by the given expression.
      * @param {string} variable
-     * @param {string|Expression} expr
-     * @returns {Expression}
+     * @param {string|ExprEvalExpression} expr
+     * @returns {ExprEvalExpression}
      */
     substitute(variable, expr) {
-        if(!(expr instanceof Expression)) {
+        if(!(expr instanceof ExprEvalExpression)) {
             expr = this.parser.parse(String(expr))
         }
 
-        return new Expression(substitute(this.tokens, variable, expr), this.parser)
+        return new ExprEvalExpression(substitute(this.tokens, variable, expr), this.parser)
     }
 
     /**
@@ -527,7 +527,7 @@ export class Expression {
     /**
      * Converts the expression to a JS function.
      * @param {string} param - Parsed variables for the function.
-     * @param {Object.<string, (Expression|string)>} variables - Default variables to provide.
+     * @param {Object.<string, (ExprEvalExpression|string)>} variables - Default variables to provide.
      * @returns {function(...any)}
      */
     toJSFunction(param, variables) {
diff --git a/LogarithmPlotter/qml/eu/ad5001/LogarithmPlotter/js/lib/expr-eval/parser.mjs b/LogarithmPlotter/qml/eu/ad5001/LogarithmPlotter/js/lib/expr-eval/parser.mjs
index 3336fcf..71a1c95 100644
--- a/LogarithmPlotter/qml/eu/ad5001/LogarithmPlotter/js/lib/expr-eval/parser.mjs
+++ b/LogarithmPlotter/qml/eu/ad5001/LogarithmPlotter/js/lib/expr-eval/parser.mjs
@@ -25,7 +25,7 @@
 import * as Polyfill from "./polyfill.mjs"
 import { ParserState } from "./parserstate.mjs"
 import { TEOF, TokenStream } from "./tokens.mjs"
-import { Expression } from "./expression.mjs"
+import { ExprEvalExpression } from "./expression.mjs"
 
 const optionNameMap = {
     "+": "add",
@@ -156,7 +156,7 @@ export class Parser {
         parserState.parseExpression(instr)
         parserState.expect(TEOF, QT_TRANSLATE_NOOP("error", "EOF"))
 
-        return new Expression(instr, this)
+        return new ExprEvalExpression(instr, this)
     }
 
     evaluate(expr, variables) {
diff --git a/LogarithmPlotter/qml/eu/ad5001/LogarithmPlotter/js/math/expression.mjs b/LogarithmPlotter/qml/eu/ad5001/LogarithmPlotter/js/math/expression.mjs
index 8a7bf77..6505018 100644
--- a/LogarithmPlotter/qml/eu/ad5001/LogarithmPlotter/js/math/expression.mjs
+++ b/LogarithmPlotter/qml/eu/ad5001/LogarithmPlotter/js/math/expression.mjs
@@ -41,7 +41,11 @@ export class Expression {
             this.cachedValue = this.calc.evaluate(Objects.currentObjectsByName)
         this.latexMarkup = Latex.expression(this.calc.tokens)
     }
-    
+
+    variables() {
+        return this.calc.variables()
+    }
+
     isConstant() {
         let vars = this.calc.variables()
         return !vars.includes("x") && !vars.includes("n")
diff --git a/LogarithmPlotter/qml/eu/ad5001/LogarithmPlotter/js/module/expreval.mjs b/LogarithmPlotter/qml/eu/ad5001/LogarithmPlotter/js/module/expreval.mjs
index f936541..5ac849e 100644
--- a/LogarithmPlotter/qml/eu/ad5001/LogarithmPlotter/js/module/expreval.mjs
+++ b/LogarithmPlotter/qml/eu/ad5001/LogarithmPlotter/js/module/expreval.mjs
@@ -79,6 +79,7 @@ export class ExprParserAPI extends Module {
 
     /**
      * @param {string} expression - Expression to parse
+     * @returns {ExprEvalExpression}
      */
     parse(expression) {
         return this._parser.parse(expression)
diff --git a/LogarithmPlotter/qml/eu/ad5001/LogarithmPlotter/js/preferences/common.mjs b/LogarithmPlotter/qml/eu/ad5001/LogarithmPlotter/js/preferences/common.mjs
index 37c7577..1e708ca 100644
--- a/LogarithmPlotter/qml/eu/ad5001/LogarithmPlotter/js/preferences/common.mjs
+++ b/LogarithmPlotter/qml/eu/ad5001/LogarithmPlotter/js/preferences/common.mjs
@@ -107,7 +107,7 @@ export class ExpressionSetting extends Setting {
      * @param {Expression} value
      */
     set(value) {
-        let vars = value.calc.variables()
+        let vars = value.variables()
         if(vars.length === this.variables.length && vars.every(x => this.variables.includes(x)))
             Helper.setSetting(this.nameInConfig, value)
         else {