diff --git a/ApplicationLibCode/FileInterface/RifFaultReactivationModelExporter.cpp b/ApplicationLibCode/FileInterface/RifFaultReactivationModelExporter.cpp
index 12b6a85c66..9c92aba14f 100644
--- a/ApplicationLibCode/FileInterface/RifFaultReactivationModelExporter.cpp
+++ b/ApplicationLibCode/FileInterface/RifFaultReactivationModelExporter.cpp
@@ -316,6 +316,15 @@ std::pair<bool, std::string>
         }
     }
 
+    std::string partSymmetry = "XSYMM";
+    for ( const auto& part : parts )
+    {
+        auto partNameIt = partNames.find( part );
+        CAF_ASSERT( partNameIt != partNames.end() );
+        std::string partName = partNameIt->second;
+        printBoundaryCondition( stream, partName + "." + partName, partSymmetry );
+    }
+
     return { true, "" };
 }