diff --git a/Geo/MQuadrangle.h b/Geo/MQuadrangle.h
index 0ceffbcf55cf156ee2b5b5bb1912aa8022f58a3e..a4d744609f5a95fd816930a46c82f4291dbc4a15 100644
--- a/Geo/MQuadrangle.h
+++ b/Geo/MQuadrangle.h
@@ -330,6 +330,7 @@ class MQuadrangle9 : public MQuadrangle {
   virtual int getTypeForMSH() const { return MSH_QUA_9; }
   virtual int getTypeForVTK() const { return 28; }
   virtual const char *getStringForPOS() const { return "SQ2"; }
+  virtual const char *getStringForBDF() const { return "CQUAD9"; }
   virtual const char *getStringForDIFF() const { return "ElmB9n2D"; }
   virtual const char *getStringForTOCHNOG() const { return "-quad9"; }
   virtual void reverse()