diff --git a/src/OpenFOAM/global/fileOperations/collatedFileOperation/OFstreamCollator.C b/src/OpenFOAM/global/fileOperations/collatedFileOperation/OFstreamCollator.C
index 597d1c514..d6d1e7303 100644
--- a/src/OpenFOAM/global/fileOperations/collatedFileOperation/OFstreamCollator.C
+++ b/src/OpenFOAM/global/fileOperations/collatedFileOperation/OFstreamCollator.C
@@ -430,7 +430,7 @@ bool Foam::OFstreamCollator::write
                 << " using communicator " << comm_ << endl;
         }
 
-        if (!UPstream::haveThreads)
+        if (!UPstream::haveThreads())
         {
             FatalErrorInFunction
                 << "mpi does not seem to have thread support."