diff --git a/lib_com/options.h b/lib_com/options.h
index b35772ecc107f07e911c782b88287393e5eea71d..886c8e5acb6191e2cf62e354c224b0319e53d578 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -211,6 +211,8 @@
 #define FIX_622_SILENCE_USAN_WARNING                    /* FhG: silenceusan warning in ifft code */
 
 #define FIX_615_UBSAN_SPAR_TO_DIRAC                     /*Dlb : Fix for UBSAN issue 615*/
+#define FIX_616_DIV_ZERO_MCT                            /*FhG : Fix UBSAN division by zero error of issue 616*/
+
 /* ################## End BE DEVELOPMENT switches ######################### */
 
 
diff --git a/lib_enc/ivas_mct_core_enc.c b/lib_enc/ivas_mct_core_enc.c
old mode 100755
new mode 100644
index 0c98f82d056c14fdccb22168f313ba6963a80b52..99eb1d9eb54c821911b006c5fcfeb7f89b2c34ad
--- a/lib_enc/ivas_mct_core_enc.c
+++ b/lib_enc/ivas_mct_core_enc.c
@@ -143,8 +143,13 @@ static void AdjustChannelRatios(
     }
     for ( i = 3; i < nChannels; i++ )
     {
+#ifdef FIX_616_DIV_ZERO_MCT
+        cur_ratio = (float) chBitRatios[i] / ( sum_ratio + FLT_MIN );
+        tar_ratio = (float) force_ch_bit_ratios[i] / ( sum_tar_ratio + FLT_MIN );
+#else
         cur_ratio = (float) chBitRatios[i] / sum_ratio;
         tar_ratio = (float) force_ch_bit_ratios[i] / sum_tar_ratio;
+#endif
 
         tar_ratio = min( tar_ratio, cur_ratio );
         chBitRatios[i] = (int16_t) ( tar_ratio * sum_tar_ratio );