diff --git a/src/edgeMesh/featureEdgeMesh/featureEdgeMesh.C b/src/edgeMesh/featureEdgeMesh/featureEdgeMesh.C
index cff0dad215..43f57465d9 100644
--- a/src/edgeMesh/featureEdgeMesh/featureEdgeMesh.C
+++ b/src/edgeMesh/featureEdgeMesh/featureEdgeMesh.C
@@ -78,9 +78,18 @@ Foam::featureEdgeMesh::featureEdgeMesh(const IOobject& io)
     if
     (
         io.readOpt() == IOobject::MUST_READ
+     || io.readOpt() == IOobject::MUST_READ_IF_MODIFIED
      || (io.readOpt() == IOobject::READ_IF_PRESENT && headerOk())
     )
     {
+        if (readOpt() == IOobject::MUST_READ_IF_MODIFIED)
+        {
+            WarningIn("featureEdgeMesh::featureEdgeMesh(const IOobject&)")
+                << "Specified IOobject::MUST_READ_IF_MODIFIED but class"
+                << " does not support automatic rereading."
+                << endl;
+        }
+
         dictionary edgeMeshDict(readStream(typeName));
 
         edgeMesh::operator=