diff --git a/lib_com/options.h b/lib_com/options.h
index 10f358572ab5cf78f475f81a6f690a56c6736054..0e4e064ab7ab3ff96f7bd1869549642bc21dd050 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -202,9 +202,9 @@
 #define FIX_626_VARIABLE_TYPE_MDCT_CONC                 /* FhG: trivial fix to fix USAN error */
 
 #define FIX_616_DIV_ZERO_MCT                            /*FhG : Fix UBSAN division by zero error of issue 616*/
-
 #define FIX617_UBSAN_DIVBYZERO_STEREOCNG                /* Eri: Issue 617: Decoder UBSAN: division by zero in stereo cng when inut is 16kHz and output is 32kHz */
 #define FIX_279_CODE_COVERAGE                           /* Dlb : issue 279 , clean up unused function */
+#define FIX_549_PARAM_ISM_BIN_GAIN                      /* FhG: Issue 549 : fix too quiet binaural output in ParamISM */
 
 /* ################## End BE DEVELOPMENT switches ######################### */
 
diff --git a/lib_dec/ivas_dec.c b/lib_dec/ivas_dec.c
index 5ca878a00ec58382864b493b2665782dbb4f20a9..8a66e36024ef018643c29d4b8b98aad7d4f8cc45 100644
--- a/lib_dec/ivas_dec.c
+++ b/lib_dec/ivas_dec.c
@@ -212,6 +212,11 @@ ivas_error ivas_dec(
         {
             if ( st_ivas->renderer_type == RENDERER_BINAURAL_PARAMETRIC || st_ivas->renderer_type == RENDERER_BINAURAL_PARAMETRIC_ROOM || st_ivas->renderer_type == RENDERER_STEREO_PARAMETRIC )
             {
+#ifdef FIX_549_PARAM_ISM_BIN_GAIN
+                /* loudness correction */
+                ivas_dirac_dec_binaural_sba_gain( output, st_ivas->nchan_transport, output_frame );
+#endif
+
                 ivas_param_ism_params_to_masa_param_mapping( st_ivas );
 
                 ivas_dirac_dec_binaural( st_ivas, st_ivas->hCombinedOrientationData, output, st_ivas->nchan_transport );