diff --git a/lib_enc/tns_base_enc_fx.c b/lib_enc/tns_base_enc_fx.c
index 4d715dc3cd897558969e1c85d06cae23eb5d0485..9790bbae23e59b711aff1559f789e2d700f3eb1f 100644
--- a/lib_enc/tns_base_enc_fx.c
+++ b/lib_enc/tns_base_enc_fx.c
@@ -690,7 +690,7 @@ Word16 DetectTnsFilt_ivas_fx( STnsConfig const *pTnsConfig, /* i  : TNS Configur
             pWindow = tnsAcfWindow_fx;
 
             n = sub( iEndLine, iStartLine );
-            assert( n < (Word16) ( sizeof( tmpbuf ) / sizeof( Word16 ) ) );
+            assert( n <= (Word16) ( sizeof( tmpbuf ) / sizeof( Word16 ) ) );
             FOR( i = 0; i < n; i++ )
             {
                 tmpbuf[i] = round_fx_sat( L_shl( pSpectrum[iStartLine + i], shift ) ); // using round_fx_sat to address corner case