diff --git a/lib_com/prot_fx.h b/lib_com/prot_fx.h
index dcd22861c79ff7c158a515240e96d3d04d0e69db..9506a5da1ad1ee680186eec27cb480931a845b99 100644
--- a/lib_com/prot_fx.h
+++ b/lib_com/prot_fx.h
@@ -7631,14 +7631,6 @@ void HQ_nbfec_init_fx(
     HQ_NBFEC_HANDLE hHQ_nbfec /* i/o: HQ NB FEC data handle  */
 );
 
-void GetAttackForTCXDecision_fx(
-    Word32 const *pSubblockNrg,
-    Word32 const *pAccSubblockNrg,
-    Word16 nSubblocks,
-    Word16 nPastSubblocks,
-    Word16 attackRatioThreshold,
-    Word16 *pbIsAttackPresent,
-    Word16 *pAttackIndex );
 
 void hq_ecu_fx(
     const Word16 *prevsynth, /* i   : buffer of previously synthesized signal     */
diff --git a/lib_enc/transient_detection_fx.c b/lib_enc/transient_detection_fx.c
index bb8239f90a4ab6ae55edc1b245017274bec24154..b0593456d05d7aeada3e57c854eb50b4a398e020 100644
--- a/lib_enc/transient_detection_fx.c
+++ b/lib_enc/transient_detection_fx.c
@@ -259,88 +259,6 @@ static void GetAttackForTCXDecision_ivas_fx(
 }
 
 
-void GetAttackForTCXDecision_fx(
-    Word32 const *pSubblockNrg,
-    Word32 const *pAccSubblockNrg,
-    Word16 nSubblocks,
-    Word16 nPastSubblocks,
-    Word16 attackRatioThreshold,
-    Word16 *pbIsAttackPresent,
-    Word16 *pAttackIndex )
-{
-    Word16 i;
-    Word16 bIsAttackPresent, attackIndex;
-    Word16 attackRatioThreshold_1_5;
-
-    assert( nSubblocks >= NSUBBLOCKS );
-    assert( nPastSubblocks >= 2 );
-
-    /* attackRatioThreshold_1_5 = attackRatioThreshold * 1.5, exponent is ATTACKTHRESHOLD_E+1 */
-    attackRatioThreshold_1_5 = add( shr( attackRatioThreshold, 2 ), shr( attackRatioThreshold, 1 ) );
-
-    move16();
-    move16();
-    bIsAttackPresent = FALSE;
-    attackIndex = 0;
-    /* Search for the last attack in the subblocks */
-    if ( s_or( (Word16) GT_32( L_shr( pSubblockNrg[-1], ATTACKTHRESHOLD_E ), Mpy_32_16_1( pAccSubblockNrg[-1], attackRatioThreshold ) ),
-               L_sub( L_shr( pSubblockNrg[-2], ATTACKTHRESHOLD_E ), Mpy_32_16_1( pAccSubblockNrg[-2], attackRatioThreshold ) ) > 0 ) )
-    {
-        move16();
-        bIsAttackPresent = TRUE;
-    }
-
-    FOR( i = 0; i < NSUBBLOCKS; i++ )
-    {
-        IF( GT_32( L_shr( pSubblockNrg[i], ATTACKTHRESHOLD_E ), Mpy_32_16_1( pAccSubblockNrg[i], attackRatioThreshold ) ) )
-        {
-            if ( i < 6 )
-            {
-                move16();
-                bIsAttackPresent = TRUE;
-            }
-
-            if ( s_and( (Word16) NE_16( attackIndex, 2 ), (Word16) NE_16( attackIndex, 6 ) ) )
-            {
-                move16();
-                attackIndex = i;
-            }
-        }
-        ELSE /* no attack, but set index anyway in case of strong energy increase */
-        {
-            IF( s_and( ( (Word16) GT_32( L_shr( pSubblockNrg[i], 1 + ATTACKTHRESHOLD_E ), Mpy_32_16_1( pSubblockNrg[sub( i, 1 )], attackRatioThreshold_1_5 ) ) ),
-                       ( L_sub( L_shr( pSubblockNrg[i], 1 + ATTACKTHRESHOLD_E ), Mpy_32_16_1( pSubblockNrg[sub( i, 2 )], attackRatioThreshold_1_5 ) ) > 0 ) ) )
-            {
-
-                if ( s_and( (Word16) NE_16( attackIndex, 2 ), (Word16) NE_16( attackIndex, 6 ) ) )
-                {
-                    move16();
-                    attackIndex = i;
-                }
-            }
-        }
-    }
-    /* avoid post-echos on click sounds (very short transients) due to TNS aliasing */
-    if ( EQ_16( attackIndex, 4 ) )
-    {
-        move16();
-        attackIndex = 7;
-    }
-    if ( EQ_16( attackIndex, 5 ) )
-    {
-        move16();
-        attackIndex = 6;
-    }
-
-    move16();
-    move16();
-    *pAttackIndex = attackIndex;
-    *pbIsAttackPresent = bIsAttackPresent;
-
-    return;
-}
-
-
 /** Initialize TCX transient detector.
  * See InitTransientDetector_fx for definition of parameters.
  */