diff --git a/lib_dec/tonalMDCTconcealment_fx.c b/lib_dec/tonalMDCTconcealment_fx.c
index 93e2f24cc737086744f535ca95494e0a3b3315b9..fa49a85f3442cce69e51fbd8be54ef4885ab5ae0 100644
--- a/lib_dec/tonalMDCTconcealment_fx.c
+++ b/lib_dec/tonalMDCTconcealment_fx.c
@@ -1283,7 +1283,7 @@ void TonalMDCTConceal_Detect_ivas_fx(
                 nSamples = hTonalMDCTConc->nNonZeroSamples;
                 move16();
 
-                s = getScaleFactor32( secondLastMDST, nSamples );
+                s = sub( getScaleFactor32( secondLastMDST, nSamples ), 1 );
 
                 FOR( i = 0; i < nSamples; i++ )
                 {
@@ -1292,7 +1292,7 @@ void TonalMDCTConceal_Detect_ivas_fx(
                 }
                 secondLastMDST_exp = sub( secondLastMDST_exp, s );
                 move16();
-                s = getScaleFactor32( secondLastMDCT, nSamples );
+                s = sub( getScaleFactor32( secondLastMDCT, nSamples ), 1 );
 
                 FOR( i = 0; i < nSamples; i++ )
                 {