diff --git a/ApplicationLibCode/ReservoirDataModel/RigFaultReactivationModelGenerator.cpp b/ApplicationLibCode/ReservoirDataModel/RigFaultReactivationModelGenerator.cpp
index 3f7142df90..55740bb665 100644
--- a/ApplicationLibCode/ReservoirDataModel/RigFaultReactivationModelGenerator.cpp
+++ b/ApplicationLibCode/ReservoirDataModel/RigFaultReactivationModelGenerator.cpp
@@ -154,6 +154,8 @@ void RigFaultReactivationModelGenerator::setupLocalCoordinateTransform()
 {
     auto [xNormal, yNormal] = modelLocalNormalsXY();
 
+    yNormal = -1.0 * yNormal;
+
     m_localCoordTransform = cvf::Mat4d::fromCoordSystemAxes( &xNormal, &yNormal, &cvf::Vec3d::Z_AXIS );
     cvf::Vec3d center     = m_startPosition * -1.0;
     center.z()            = 0.0;