diff --git a/ApplicationCode/ModelVisualization/RivWellFracturePartMgr.cpp b/ApplicationCode/ModelVisualization/RivWellFracturePartMgr.cpp
index 6f143be443..4077c56e24 100644
--- a/ApplicationCode/ModelVisualization/RivWellFracturePartMgr.cpp
+++ b/ApplicationCode/ModelVisualization/RivWellFracturePartMgr.cpp
@@ -69,7 +69,7 @@ void RivWellFracturePartMgr::updatePartGeometry(caf::DisplayCoordTransform* disp
         const std::vector<cvf::uint>& triangleIndices = m_rimFracture->triangleIndices();
         std::vector<cvf::Vec3f> displayCoords;
 
-        for (int i = 0; i < nodeCoords.size(); i++)
+        for (size_t i = 0; i < nodeCoords.size(); i++)
         {
             cvf::Vec3d nodeCoordsDouble = static_cast<cvf::Vec3d>(nodeCoords[i]);
             cvf::Vec3d displayCoordsDouble = displayCoordTransform->transformToDisplayCoord(nodeCoordsDouble);
diff --git a/ApplicationCode/ReservoirDataModel/RigCellGeometryTools.cpp b/ApplicationCode/ReservoirDataModel/RigCellGeometryTools.cpp
index 4b9db23673..9c587992c1 100644
--- a/ApplicationCode/ReservoirDataModel/RigCellGeometryTools.cpp
+++ b/ApplicationCode/ReservoirDataModel/RigCellGeometryTools.cpp
@@ -241,7 +241,7 @@ double RigCellGeometryTools::polygonAreaWeightedLength(cvf::Vec3d directionOfLen
     double totalArea = 0.0;
     double totalAreaXlength = 0.0;
 
-    for (int i = 0; i < areasOfPolygonContributions.size(); i++)
+    for (size_t i = 0; i < areasOfPolygonContributions.size(); i++)
     {
         totalArea += areasOfPolygonContributions[i];
         totalAreaXlength += (areasOfPolygonContributions[i] * lengthOfPolygonContributions[i]);
diff --git a/ApplicationCode/ReservoirDataModel/RigWellPath.cpp b/ApplicationCode/ReservoirDataModel/RigWellPath.cpp
index 61dbfeb9cf..161919196b 100644
--- a/ApplicationCode/ReservoirDataModel/RigWellPath.cpp
+++ b/ApplicationCode/ReservoirDataModel/RigWellPath.cpp
@@ -59,7 +59,7 @@ cvf::Vec3d RigWellPath::interpolatedPointAlongWellPath(double measuredDepth)
 {
     cvf::Vec3d wellPathPoint = cvf::Vec3d::ZERO;
 
-    int i = 0;
+    size_t i = 0;
     while (i < m_measuredDepths.size() && m_measuredDepths.at(i) < measuredDepth )
     {
         i++;