diff --git a/src/core/expression/qgsexpressionfunction.cpp b/src/core/expression/qgsexpressionfunction.cpp
index 6b557ecfd79..41ef05ce8e6 100644
--- a/src/core/expression/qgsexpressionfunction.cpp
+++ b/src/core/expression/qgsexpressionfunction.cpp
@@ -375,8 +375,8 @@ static QVariant fcnRndF( const QVariantList &values, const QgsExpressionContext
     return QVariant();
 
   std::random_device rd;
-  std::mt19937_64 generator(rd());
-  std::uniform_real_distribution<double> dist(min, max);
+  std::mt19937_64 generator( rd() );
+  std::uniform_real_distribution<double> dist( min, max );
 
   if ( !QgsExpressionUtils::isNull( values.at( 2 ) ) )
   {
@@ -397,7 +397,7 @@ static QVariant fcnRndF( const QVariantList &values, const QgsExpressionContext
   }
 
   // Return a random integer in the range [min, max] (inclusive)
-  return QVariant( dist(generator) );
+  return QVariant( dist( generator ) );
 }
 static QVariant fcnRnd( const QVariantList &values, const QgsExpressionContext *, QgsExpression *parent, const QgsExpressionNodeFunction * )
 {
@@ -407,8 +407,8 @@ static QVariant fcnRnd( const QVariantList &values, const QgsExpressionContext *
     return QVariant();
 
   std::random_device rd;
-  std::mt19937_64 generator(rd());
-  std::uniform_int_distribution<qlonglong> dist(min, max);
+  std::mt19937_64 generator( rd() );
+  std::uniform_int_distribution<qlonglong> dist( min, max );
 
   if ( !QgsExpressionUtils::isNull( values.at( 2 ) ) )
   {
@@ -429,7 +429,7 @@ static QVariant fcnRnd( const QVariantList &values, const QgsExpressionContext *
   }
 
   // Return a random integer in the range [min, max] (inclusive)
-  return QVariant( dist(generator) );
+  return QVariant( dist( generator ) );
 }
 
 static QVariant fcnLinearScale( const QVariantList &values, const QgsExpressionContext *, QgsExpression *parent, const QgsExpressionNodeFunction * )
diff --git a/tests/src/core/testqgsexpression.cpp b/tests/src/core/testqgsexpression.cpp
index 3dbec218296..6485cc4b035 100644
--- a/tests/src/core/testqgsexpression.cpp
+++ b/tests/src/core/testqgsexpression.cpp
@@ -2209,16 +2209,16 @@ class TestQgsExpression: public QObject
       // Supports multiple type of seeds
       QgsExpression exp4( QStringLiteral( "randf(1,100,123)" ) );
       QVariant v4 = exp4.evaluate();
-      QCOMPARE( v4.type(), QVariant::Float );
+      QCOMPARE( v4.type(), QVariant::Double );
       QgsExpression exp5( QStringLiteral( "randf(1,100,1.23)" ) );
       QVariant v5 = exp5.evaluate();
-      QCOMPARE( v5.type(), QVariant::Float );
+      QCOMPARE( v5.type(), QVariant::Double );
       QgsExpression exp6( QStringLiteral( "randf(1,100,'123')" ) );
       QVariant v6 = exp6.evaluate();
-      QCOMPARE( v6.type(), QVariant::Float );
+      QCOMPARE( v6.type(), QVariant::Double );
       QgsExpression exp7( QStringLiteral( "randf(1,100,'abc')" ) );
       QVariant v7 = exp7.evaluate();
-      QCOMPARE( v7.type(), QVariant::Float );
+      QCOMPARE( v7.type(), QVariant::Double );
 
       // Two calls with the same seed return the same numer
       QgsExpression exp8( QStringLiteral( "randf(seed:=1)" ) );