diff --git a/lib_com/options.h b/lib_com/options.h
index d53b7d6a30590f91df7352489242629fa278a15a..885e75e65136e9ace00db2bb0825febd1be8b0c5 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -83,6 +83,7 @@
 #define FIX_2164_ASSERT_IN_OMASA_PREPROC_FOR_EDIT            /* Nokia: Issue 2164: Prevent overflow when calculating equalization coefficient for editing before clamping to safe range */
 #define FIX_BASOP_ASSERT_IN_TONAL_MDCT_PLC                   /* FhG: fix for issue 2165 - using saturating addition in tonal MDCT PLC function */
 #define OPT_2146_BASOP_UTIL_ADD_MANT32EXP                    /* Dlb: optimized version of BASOP_Util_Add_Mant32Exp() */
+#define FIX_2166_ASSERT_OSBA_PLC_STEREO_OUT                  /* FhG: fix for issue 2166 - add missing averaging factor 0.5 in for the sum of energies in function stereo_dft_dmx_swb_nrg_fx()*/
 
 #define FIX_1793_DEC_MC_TO_MONO_SCALING_ISSUE                /* FhG: Use dynamic Q factor for synth_fx and synthFB_fx to prevent overflow */
 /* ################### End FIXES switches ########################### */
diff --git a/lib_dec/ivas_stereo_dft_plc_fx.c b/lib_dec/ivas_stereo_dft_plc_fx.c
index 4b47d0a1d840d2564975bc4e57e5b3039fb4169c..607892b2a07dc5500749c1a7f975330b19001507 100644
--- a/lib_dec/ivas_stereo_dft_plc_fx.c
+++ b/lib_dec/ivas_stereo_dft_plc_fx.c
@@ -785,18 +785,33 @@ Word32 stereo_dft_dmx_swb_nrg_fx(
     {
         FOR( i = 0; i < frame_length / 2; i++ )
         {
+#ifdef FIX_2166_ASSERT_OSBA_PLC_STEREO_OUT
+            dmx_nrg = L_add( dmx_nrg,
+                             L_shr( L_add( Madd_32_32( Mpy_32_32( dmx_k0[2 * i], dmx_k0[2 * i] ), dmx_k0[2 * i + 1], dmx_k0[2 * i + 1] ),
+                                           Madd_32_32( Mpy_32_32( dmx_k1[2 * i], dmx_k1[2 * i] ), dmx_k1[2 * i + 1], dmx_k1[2 * i + 1] ) ),
+                                    1 ) ); /* Q0 */
+#else
             dmx_nrg = L_add( dmx_nrg,
                              L_add( Madd_32_32( Mpy_32_32( dmx_k0[2 * i], dmx_k0[2 * i] ), dmx_k0[2 * i + 1], dmx_k0[2 * i + 1] ),
                                     Madd_32_32( Mpy_32_32( dmx_k1[2 * i], dmx_k1[2 * i] ), dmx_k1[2 * i + 1], dmx_k1[2 * i + 1] ) ) ); /* Q0 */
+#endif
         }
     }
     ELSE
     {
         FOR( i = 0; i < frame_length / 2; i++ )
         {
+#ifdef FIX_2166_ASSERT_OSBA_PLC_STEREO_OUT
+            dmx_nrg = L_add( dmx_nrg,
+                             L_shr( L_add( L_shl( Madd_32_32( Mpy_32_32( dmx_k0[2 * i], dmx_k0[2 * i] ), dmx_k0[2 * i + 1], dmx_k0[2 * i + 1] ), q0 ),
+                                           L_shl( Madd_32_32( Mpy_32_32( dmx_k1[2 * i], dmx_k1[2 * i] ), dmx_k1[2 * i + 1], dmx_k1[2 * i + 1] ), q1 ) ),
+                                    1 ) ); /*3*q0 - 31*/
+#else
             dmx_nrg = L_add( dmx_nrg,
                              L_add( L_shl( Madd_32_32( Mpy_32_32( dmx_k0[2 * i], dmx_k0[2 * i] ), dmx_k0[2 * i + 1], dmx_k0[2 * i + 1] ), q0 ),
                                     L_shl( Madd_32_32( Mpy_32_32( dmx_k1[2 * i], dmx_k1[2 * i] ), dmx_k1[2 * i + 1], dmx_k1[2 * i + 1] ), q1 ) ) ); /*3*q0 - 31*/
+
+#endif
         }
     }