diff --git a/lib_com/options.h b/lib_com/options.h
index eead3c8ca079bf6a5b6cfc35eefc9b60ece6149d..3022909a35ae61f8ac37c70f8e8a4646134edd9d 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -123,6 +123,7 @@
 #define FIX_BASOP_2497_MCMASA_LFE_WRONG_SF_INDEX        /* Nokia: BASOP 2497: Fix wrong subframe index in McMASA LFE synth. */
 #define FIX_BASOP_2496_OMASA_OBJ_EDIT_WRONG_ASSIGN      /* Nokia: BASOP 2496: Fix wrong assignment in OMASA object edit code */
 #define FIX_2495_Q_ALIGN_OSBA_RENDERER                  /* FhG: Basop issue #2495: Corrected exponent scaling of outAudio.data_fx before buffer accumulation in renderSbaToBinaural(). */
+#define FIX_BASOP_2511_PROTO_REF_POWER_FIX              /* FhG: BASOP 2511; Fix reference power computation in protoSignalComputation_shd_fx() */
 
 /* ##################### End NON-BE switches ########################### */
 
diff --git a/lib_rend/ivas_dirac_rend_fx.c b/lib_rend/ivas_dirac_rend_fx.c
index 67ded0b8b8c7daa13e7b931acd6566e23c4ad2ec..2d7004b35955400d704d5686dbf4a3eeefc2db88 100644
--- a/lib_rend/ivas_dirac_rend_fx.c
+++ b/lib_rend/ivas_dirac_rend_fx.c
@@ -1482,7 +1482,11 @@ void protoSignalComputation_shd_fx(
                     move32();
                     *p_k_fx[k] = L_shl( *p_k_fx[k], Q1 ); // left shift is done to maintain constant Q factor Q(q_cldfb+min_q_shift)
                     move32();
+#ifdef FIX_BASOP_2511_PROTO_REF_POWER_FIX
+                    reference_power_fx[idx1] = Madd_32_32( reference_power_fx[idx1], *p_k_fx[k], *p_k_fx[k] ); // Q(2*(q_cldfb + min_q_shift)-31)
+#else
                     reference_power_fx[idx1] = Mpy_32_32( *p_k_fx[k], *p_k_fx[k] ); // Q(2*(q_cldfb + min_q_shift)-31)
+#endif
                     move32();
                     p_k_fx[k]++;