diff --git a/lib_com/options.h b/lib_com/options.h
index 343515281cd9ed3dabd01c37b43f2392338dee68..9c1d0b089096bf7b76300ce2948fab698089a5ed 100644
--- a/lib_com/options.h
+++ b/lib_com/options.h
@@ -108,4 +108,5 @@
 #define FIX_1132_STACK_CORRUPTION               /* Stack corruption issue due of extending index access*/
 #define FIX_ISSUE_1092                          /* Ittiam: Fix for Issue 1092: BASOP asserts in stereo fx encoder for selection test inputs*/
 #define FIX_ISSUE_1148
+#define FIX_ISSUE_1147                          /*Ittiam: Fix for issue 1147: Added saturation in DetectTnsFilt_fx.*/
 #endif
diff --git a/lib_enc/tns_base_enc_fx.c b/lib_enc/tns_base_enc_fx.c
index 34d23e22b2029ab1328323629c595b6da894c843..2f1762e435858dfbee8bee8b2791c5a8ff47312d 100644
--- a/lib_enc/tns_base_enc_fx.c
+++ b/lib_enc/tns_base_enc_fx.c
@@ -230,7 +230,11 @@ Word16 DetectTnsFilt_fx( STnsConfig const *pTnsConfig,
             assert( n < (Word16) ( sizeof( tmpbuf ) / sizeof( Word16 ) ) );
             FOR( i = 0; i < n; i++ )
             {
+#ifdef FIX_ISSUE_1147
+                tmpbuf[i] = round_fx_sat( L_shl( pSpectrum[iStartLine + i], shift ) );
+#else
                 tmpbuf[i] = round_fx( L_shl( pSpectrum[iStartLine + i], shift ) );
+#endif
             }
 
             FOR( lag = 0; lag <= pTnsConfig->maxOrder; lag++ )