diff --git a/src/core/processing/models/qgsprocessingmodelchildparametersource.cpp b/src/core/processing/models/qgsprocessingmodelchildparametersource.cpp
index af5903e19f9..abf50449b4c 100644
--- a/src/core/processing/models/qgsprocessingmodelchildparametersource.cpp
+++ b/src/core/processing/models/qgsprocessingmodelchildparametersource.cpp
@@ -169,7 +169,7 @@ QString QgsProcessingModelChildParameterSource::asPythonCode( const QgsProcessin
       }
 
     case Expression:
-      return QStringLiteral( "QgsExpression('%1').evaluate()" ).arg( mExpression );
+      return QStringLiteral( "QgsExpression(%1).evaluate()" ).arg( QgsProcessingUtils::stringToPythonLiteral( mExpression ) );
 
     case ExpressionText:
       return mExpressionText;
diff --git a/tests/src/analysis/testqgsprocessing.cpp b/tests/src/analysis/testqgsprocessing.cpp
index 66ba8a1059a..e9251655703 100644
--- a/tests/src/analysis/testqgsprocessing.cpp
+++ b/tests/src/analysis/testqgsprocessing.cpp
@@ -6894,6 +6894,9 @@ void TestQgsProcessing::modelerAlgorithm()
   expSource.setExpression( "1+3" );
   QCOMPARE( expSource.expression(), QStringLiteral( "1+3" ) );
   QCOMPARE( expSource.asPythonCode( QgsProcessing::PythonQgsProcessingAlgorithmSubclass, nullptr, friendlyNames ), QStringLiteral( "QgsExpression('1+3').evaluate()" ) );
+  expSource.setExpression( "'a' || 'b\\'c'" );
+  QCOMPARE( expSource.expression(), QStringLiteral( "'a' || 'b\\'c'" ) );
+  QCOMPARE( expSource.asPythonCode( QgsProcessing::PythonQgsProcessingAlgorithmSubclass, nullptr, friendlyNames ), QStringLiteral( "QgsExpression('\\'a\\' || \\'b\\\\\\'c\\'').evaluate()" ) );
   expSource = QgsProcessingModelChildParameterSource::fromStaticValue( 5 );
   // check that calling setExpression flips source to Expression
   QCOMPARE( expSource.source(), QgsProcessingModelChildParameterSource::StaticValue );