diff --git a/lib_com/swb_tbe_com_fx.c b/lib_com/swb_tbe_com_fx.c
index 48322cb71fa7bbdef4dc248a5aa2704512825660..b128e02ad076d7df9bb2724953e7c4d8fc2162e2 100755
--- a/lib_com/swb_tbe_com_fx.c
+++ b/lib_com/swb_tbe_com_fx.c
@@ -6994,9 +6994,6 @@ void synthesise_fb_high_band_fx(
  *                                                                   *
  * Estimate mix factors for SHB excitation generation                *
  *-------------------------------------------------------------------*/
-#ifdef ISSUE_1836_replace_overflow_libcom
-#undef ISSUE_1836_replace_overflow_libcom
-#endif
 void Estimate_mix_factors_fx(
     const Word16 *shb_res, /* i  : SHB LP residual in Q = Q_shb */
     const Word16 Q_shb,