diff --git a/IO/NetCDF/vtkNetCDFReader.cxx b/IO/NetCDF/vtkNetCDFReader.cxx
index 1f56bf33200dc3e294c99b3a0e7f6ba330d6a898..59c929ed24d184aaa50ecb217edc5a74abf0503f 100644
--- a/IO/NetCDF/vtkNetCDFReader.cxx
+++ b/IO/NetCDF/vtkNetCDFReader.cxx
@@ -743,7 +743,7 @@ int vtkNetCDFReader::FillVariableDimensions(int ncFD)
         break;
       }
     }
-    if (unique and dimEncoding != "()")
+    if (unique && dimEncoding != "()")
       this->AllDimensions->InsertNextValue(dimEncoding);
   }