diff --git a/src/analysis/processing/qgsalgorithmdifference.cpp b/src/analysis/processing/qgsalgorithmdifference.cpp
index 401acabe40b7..76fa3b7e15f8 100644
--- a/src/analysis/processing/qgsalgorithmdifference.cpp
+++ b/src/analysis/processing/qgsalgorithmdifference.cpp
@@ -106,8 +106,8 @@ QVariantMap QgsDifferenceAlgorithm::processAlgorithm( const QVariantMap &paramet
   QVariantMap outputs;
   outputs.insert( QStringLiteral( "OUTPUT" ), dest );
 
-  int count = 0;
-  int total = sourceA->featureCount();
+  long count = 0;
+  const long total = sourceA->featureCount();
   QgsOverlayUtils::difference( *sourceA, *sourceB, *sink, context, feedback, count, total, QgsOverlayUtils::OutputA );
 
   return outputs;
diff --git a/src/analysis/processing/qgsalgorithmintersection.cpp b/src/analysis/processing/qgsalgorithmintersection.cpp
index f07bdfcb87b6..d8c3c3ec61ba 100644
--- a/src/analysis/processing/qgsalgorithmintersection.cpp
+++ b/src/analysis/processing/qgsalgorithmintersection.cpp
@@ -109,8 +109,8 @@ QVariantMap QgsIntersectionAlgorithm::processAlgorithm( const QVariantMap &param
   QVariantMap outputs;
   outputs.insert( QStringLiteral( "OUTPUT" ), dest );
 
-  int count = 0;
-  int total = sourceA->featureCount();
+  long count = 0;
+  const long total = sourceA->featureCount();
 
   QgsOverlayUtils::intersection( *sourceA, *sourceB, *sink, context, feedback, count, total, fieldIndicesA, fieldIndicesB );
 
diff --git a/src/analysis/processing/qgsalgorithmsymmetricaldifference.cpp b/src/analysis/processing/qgsalgorithmsymmetricaldifference.cpp
index 692ba652e43c..a806c9420c89 100644
--- a/src/analysis/processing/qgsalgorithmsymmetricaldifference.cpp
+++ b/src/analysis/processing/qgsalgorithmsymmetricaldifference.cpp
@@ -92,8 +92,8 @@ QVariantMap QgsSymmetricalDifferenceAlgorithm::processAlgorithm( const QVariantM
   QVariantMap outputs;
   outputs.insert( QStringLiteral( "OUTPUT" ), dest );
 
-  int count = 0;
-  int total = sourceA->featureCount() + sourceB->featureCount();
+  long count = 0;
+  const long total = sourceA->featureCount() + sourceB->featureCount();
 
   QgsOverlayUtils::difference( *sourceA, *sourceB, *sink, context, feedback, count, total, QgsOverlayUtils::OutputAB );
   if ( feedback->isCanceled() )
diff --git a/src/analysis/processing/qgsalgorithmunion.cpp b/src/analysis/processing/qgsalgorithmunion.cpp
index 1cdeedec6d4d..06591ef2e847 100644
--- a/src/analysis/processing/qgsalgorithmunion.cpp
+++ b/src/analysis/processing/qgsalgorithmunion.cpp
@@ -102,8 +102,8 @@ QVariantMap QgsUnionAlgorithm::processAlgorithm( const QVariantMap &parameters,
   QList<int> fieldIndicesA = QgsProcessingUtils::fieldNamesToIndices( QStringList(), sourceA->fields() );
   QList<int> fieldIndicesB = QgsProcessingUtils::fieldNamesToIndices( QStringList(), sourceB->fields() );
 
-  int count = 0;
-  int total = sourceA->featureCount() * 2 + sourceB->featureCount();
+  long count = 0;
+  const long total = sourceA->featureCount() * 2 + sourceB->featureCount();
 
   QgsOverlayUtils::intersection( *sourceA, *sourceB, *sink, context, feedback, count, total, fieldIndicesA, fieldIndicesB );
   if ( feedback->isCanceled() )
diff --git a/src/analysis/processing/qgsoverlayutils.cpp b/src/analysis/processing/qgsoverlayutils.cpp
index 01d1a2009a88..e077e365faa1 100644
--- a/src/analysis/processing/qgsoverlayutils.cpp
+++ b/src/analysis/processing/qgsoverlayutils.cpp
@@ -82,7 +82,7 @@ static bool sanitizeDifferenceResult( QgsGeometry &geom, QgsWkbTypes::GeometryTy
 }
 
 
-void QgsOverlayUtils::difference( const QgsFeatureSource &sourceA, const QgsFeatureSource &sourceB, QgsFeatureSink &sink, QgsProcessingContext &context, QgsProcessingFeedback *feedback, int &count, int totalCount, QgsOverlayUtils::DifferenceOutput outputAttrs )
+void QgsOverlayUtils::difference( const QgsFeatureSource &sourceA, const QgsFeatureSource &sourceB, QgsFeatureSink &sink, QgsProcessingContext &context, QgsProcessingFeedback *feedback, long &count, long totalCount, QgsOverlayUtils::DifferenceOutput outputAttrs )
 {
   QgsWkbTypes::GeometryType geometryType = QgsWkbTypes::geometryType( QgsWkbTypes::multiType( sourceA.wkbType() ) );
   QgsFeatureRequest requestB;
@@ -189,12 +189,12 @@ void QgsOverlayUtils::difference( const QgsFeatureSource &sourceA, const QgsFeat
     }
 
     ++count;
-    feedback->setProgress( count / ( double ) totalCount * 100. );
+    feedback->setProgress( count / static_cast< double >( totalCount ) * 100. );
   }
 }
 
 
-void QgsOverlayUtils::intersection( const QgsFeatureSource &sourceA, const QgsFeatureSource &sourceB, QgsFeatureSink &sink, QgsProcessingContext &context, QgsProcessingFeedback *feedback, int &count, int totalCount, const QList<int> &fieldIndicesA, const QList<int> &fieldIndicesB )
+void QgsOverlayUtils::intersection( const QgsFeatureSource &sourceA, const QgsFeatureSource &sourceB, QgsFeatureSink &sink, QgsProcessingContext &context, QgsProcessingFeedback *feedback, long &count, long totalCount, const QList<int> &fieldIndicesA, const QList<int> &fieldIndicesB )
 {
   QgsWkbTypes::GeometryType geometryType = QgsWkbTypes::geometryType( QgsWkbTypes::multiType( sourceA.wkbType() ) );
   int attrCount = fieldIndicesA.count() + fieldIndicesB.count();
@@ -267,14 +267,14 @@ void QgsOverlayUtils::intersection( const QgsFeatureSource &sourceA, const QgsFe
     }
 
     ++count;
-    feedback->setProgress( count / ( double ) totalCount * 100. );
+    feedback->setProgress( count / static_cast<double >( totalCount ) * 100. );
   }
 }
 
 void QgsOverlayUtils::resolveOverlaps( const QgsFeatureSource &source, QgsFeatureSink &sink, QgsProcessingFeedback *feedback )
 {
-  int count = 0;
-  int totalCount = source.featureCount();
+  long count = 0;
+  const long totalCount = source.featureCount();
   if ( totalCount == 0 )
     return;  // nothing to do here
 
@@ -418,7 +418,7 @@ void QgsOverlayUtils::resolveOverlaps( const QgsFeatureSource &source, QgsFeatur
     }
 
     ++count;
-    feedback->setProgress( count / ( double ) totalCount * 100. );
+    feedback->setProgress( count / static_cast< double >( totalCount ) * 100. );
   }
   if ( feedback->isCanceled() )
     return;
diff --git a/src/analysis/processing/qgsoverlayutils.h b/src/analysis/processing/qgsoverlayutils.h
index 75ecddf12bae..7b841c4fffbc 100644
--- a/src/analysis/processing/qgsoverlayutils.h
+++ b/src/analysis/processing/qgsoverlayutils.h
@@ -41,9 +41,9 @@ namespace QgsOverlayUtils
     OutputBA,  //!< Write attributes of both layers, inverted (first attributes of B, then attributes of A)
   };
 
-  void difference( const QgsFeatureSource &sourceA, const QgsFeatureSource &sourceB, QgsFeatureSink &sink, QgsProcessingContext &context, QgsProcessingFeedback *feedback, int &count, int totalCount, DifferenceOutput outputAttrs );
+  void difference( const QgsFeatureSource &sourceA, const QgsFeatureSource &sourceB, QgsFeatureSink &sink, QgsProcessingContext &context, QgsProcessingFeedback *feedback, long &count, long totalCount, DifferenceOutput outputAttrs );
 
-  void intersection( const QgsFeatureSource &sourceA, const QgsFeatureSource &sourceB, QgsFeatureSink &sink, QgsProcessingContext &context, QgsProcessingFeedback *feedback, int &count, int totalCount, const QList<int> &fieldIndicesA, const QList<int> &fieldIndicesB );
+  void intersection( const QgsFeatureSource &sourceA, const QgsFeatureSource &sourceB, QgsFeatureSink &sink, QgsProcessingContext &context, QgsProcessingFeedback *feedback, long &count, long totalCount, const QList<int> &fieldIndicesA, const QList<int> &fieldIndicesB );
 
   //! Makes sure that what came out from intersection of two geometries is good to be used in the output
   bool sanitizeIntersectionResult( QgsGeometry &geom, QgsWkbTypes::GeometryType geometryType );