diff --git a/lib_dec/ivas_out_setup_conversion_fx.c b/lib_dec/ivas_out_setup_conversion_fx.c
index 2135cd6d61693c9fea163a9ff1a496f3e524fe8b..6e78e9c6902bf5e4188d3e264f3ec4faaa583ca3 100644
--- a/lib_dec/ivas_out_setup_conversion_fx.c
+++ b/lib_dec/ivas_out_setup_conversion_fx.c
@@ -695,6 +695,11 @@ void ivas_ls_setup_conversion_process_mdct_fx(
     Word16 guard_1 = shr( add( find_guarded_bits_fx( tmp_sub ), 1 ), 1 );
     Word16 guard_2 = find_guarded_bits_fx( L_mult0( outChannels, inChannels ) );
     q_output = sub( q_output, s_max( guard_1, guard_2 ) );
+    /* Increase the guard bit by 1 to avoid overflow only if q_output is positive */
+    if ( q_output > 0 )
+    {
+        q_output = sub( q_output, 1 );
+    }
 
     FOR( i = 0; i < inChannels; ++i )
     {