diff --git a/lib_com/options.h b/lib_com/options.h
index 757452c71e2ad3154bf838f42e57de9556c30b2c..39e60980dc1048749356b2629988de05894ddb2e 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -171,6 +171,7 @@
 #define FIX_691_OSBA_CRASH                              /* FhG: Fix for issue 691: Crash for OSBA Stereo out */
 #define FIX_694_OMASA_EXTREME                           /* Nokia: fix for crash in OMASA on extreme sample */
 #define FIX_679_JBM_MC2SBA                              /* FhG: fix issue 679: check for transport vs. internal channel count in JBM prior to ivas_mc2sba() */
+#define FIX_591_PARAMISM_JBM_ENER_CORRECTION            /* FhG: fix energy correction in ParamISM rendering */
 
 #define FIX_LARGE_RENDERER_DELAY_COMP                   /* Fix renderer delay compensation with delays greater than 1 frame */
 
diff --git a/lib_dec/ivas_ism_param_dec.c b/lib_dec/ivas_ism_param_dec.c
index a30b25b532c62eeddb9077b7d254c941c5250a45..071513de38caeddfd845f50b3d83ec1d7405665d 100644
--- a/lib_dec/ivas_ism_param_dec.c
+++ b/lib_dec/ivas_ism_param_dec.c
@@ -1124,6 +1124,9 @@ void ivas_param_ism_dec_digest_tc(
     float direct_response[MAX_NUM_OBJECTS][PARAM_ISM_MAX_CHAN];
     DIRAC_DEC_HANDLE hDirAC;
     SPAT_PARAM_REND_COMMON_DATA_HANDLE hSpatParamRendCom;
+#ifdef FIX_591_PARAMISM_JBM_ENER_CORRECTION
+    int16_t fade_len;
+#endif
 
     /* Initialization */
     hDirAC = st_ivas->hDirAC;
@@ -1133,7 +1136,12 @@ void ivas_param_ism_dec_digest_tc(
     ene_tc = 0.0f;
     ene_sum = 0.0f;
     last_gain = st_ivas->hDirAC->hParamIsm->last_dmx_gain;
+#ifdef FIX_591_PARAMISM_JBM_ENER_CORRECTION
+    output_frame = nCldfbSlots * hSpatParamRendCom->num_freq_bands;
+    fade_len = output_frame / 2;
+#else
     output_frame = (int16_t) ( st_ivas->hDecoderConfig->output_Fs / FRAMES_PER_SEC );
+#endif
 
     nchan_transport = st_ivas->nchan_transport;
     ivas_total_brate = st_ivas->hDecoderConfig->ivas_total_brate;
@@ -1238,9 +1246,13 @@ void ivas_param_ism_dec_digest_tc(
     {
         /* Smoothing */
         gain = 0.75f * gain + 0.25f * last_gain;
-        /* 10ms ramp */
+#ifdef FIX_591_PARAMISM_JBM_ENER_CORRECTION
+        grad = ( gain - last_gain ) / (float) fade_len; /* slope between two consecutive gains, 480 samples length */
+        for ( i = 0; i < fade_len; i++ )
+#else
         grad = ( gain - last_gain ) * 2.0f / (float) output_frame; /* slope between two consecutive gains, 480 samples length */
-        for ( i = 0; i < ( output_frame / 2 ); i++ )
+        for ( i = 0; i < output_frame / 2; i++ )
+#endif
         {
             transport_channels_f[0][i] *= ( last_gain + i * grad );
             transport_channels_f[1][i] *= ( last_gain + i * grad );
diff --git a/lib_dec/ivas_jbm_dec.c b/lib_dec/ivas_jbm_dec.c
index da8bf7fc574f21716a2f0475fdf6ae90fe40169a..0da2fba312b3c24c155cee1d007029379e5a5117 100644
--- a/lib_dec/ivas_jbm_dec.c
+++ b/lib_dec/ivas_jbm_dec.c
@@ -207,6 +207,13 @@ ivas_error ivas_jbm_dec_tc(
         {
             ivas_mono_downmix_render_passive( st_ivas, output, output_frame );
         }
+#ifdef FIX_591_PARAMISM_JBM_ENER_CORRECTION
+        else if ( st_ivas->ism_mode == ISM_MODE_PARAM && ( st_ivas->renderer_type == RENDERER_BINAURAL_PARAMETRIC || st_ivas->renderer_type == RENDERER_BINAURAL_PARAMETRIC_ROOM || st_ivas->renderer_type == RENDERER_STEREO_PARAMETRIC ) )
+        {
+            /* loudness correction */
+            ivas_dirac_dec_binaural_sba_gain( output, st_ivas->nchan_transport, output_frame );
+        }
+#endif
     }
     else if ( st_ivas->ivas_format == SBA_FORMAT || st_ivas->ivas_format == MASA_FORMAT )
     {