diff --git a/lib_com/options.h b/lib_com/options.h
old mode 100755
new mode 100644
index ff06f7b58aa8ae9247f6950baadedb69d6b0836c..964bcd18b4afb7544d18b7c7790566b42fdb9ed1
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -158,6 +158,7 @@
 #define FIX_955_FASTCONV_REND_IN_ISM                    /* VA: put FastConv rendering call under DEBUGGING */
 #define FIX_969_USAN_IGF_ARITH                          /* FhG: issue 969: fix USAN error in igf_sce_dec; same issue as #962 */
 #define FIX_959_MASA_LINEAR_REND                        /* VA: issue 959: remove unused calling of ivas_sba_linear_renderer() in MASA rendering */
+#define FIX_971_LOG2_IDX_GAIN_0                         /* VA: prevent -Inf due to log2(ratio==0) */
 
 /* #################### End BE switches ################################## */
 
diff --git a/lib_enc/swb_tbe_enc.c b/lib_enc/swb_tbe_enc.c
index 135e856a990dee3f7efa2aae09c465498791ed4a..9fab9da4387e73525ba716365cd318da73135165 100644
--- a/lib_enc/swb_tbe_enc.c
+++ b/lib_enc/swb_tbe_enc.c
@@ -2738,6 +2738,12 @@ void fb_tbe_enc(
     hBWE_TD->prev_fb_energy = sum2_f( input_fhb + L_FRAME48k / 2, L_FRAME48k / 2 );
     fb_exc_energy = sum2_f( fb_exc, L_FRAME16k ) + EPSILON;
     ratio = (float) sqrt( temp2 / fb_exc_energy );
+#ifdef FIX_971_LOG2_IDX_GAIN_0
+    if ( ratio < 1.0f )
+    {
+        ratio = 1.0f;
+    }
+#endif
     idxGain = (int16_t) ( log2_f( (float) ratio ) + 0.5f );
     idxGain = max( 0, min( 15, idxGain ) );
     ratio = (float) ( 1 << idxGain );