diff --git a/thirdparty/README.md b/thirdparty/README.md
index 8aec75b57d2..f6edff490f6 100644
--- a/thirdparty/README.md
+++ b/thirdparty/README.md
@@ -156,7 +156,7 @@ TODO.
 ## opus
 
 - Upstream: https://opus-codec.org
-- Version: 1.1.3 (opus) and 0.8 (opusfile)
+- Version: 1.1.4 (opus) and 0.8 (opusfile)
 - License: BSD-3-Clause
 
 Files extracted from upstream source:
@@ -164,6 +164,7 @@ Files extracted from upstream source:
 - all .c and .h files in src/ (both opus and opusfile),
   except `opus_demo.c`
 - all .h files in include/ (both opus and opusfile) as opus/
+- celt/ and silk/ subfolders
 - COPYING
 
 
diff --git a/thirdparty/opus/silk/NLSF_stabilize.c b/thirdparty/opus/silk/NLSF_stabilize.c
index 1fa1ea379bd..8f3426b91e6 100644
--- a/thirdparty/opus/silk/NLSF_stabilize.c
+++ b/thirdparty/opus/silk/NLSF_stabilize.c
@@ -130,7 +130,7 @@ void silk_NLSF_stabilize(
 
         /* Keep delta_min distance between the NLSFs */
         for( i = 1; i < L; i++ )
-            NLSF_Q15[i] = silk_max_int( NLSF_Q15[i], NLSF_Q15[i-1] + NDeltaMin_Q15[i] );
+            NLSF_Q15[i] = silk_max_int( NLSF_Q15[i], silk_ADD_SAT16( NLSF_Q15[i-1], NDeltaMin_Q15[i] ) );
 
         /* Last NLSF should be no higher than 1 - NDeltaMin[L] */
         NLSF_Q15[L-1] = silk_min_int( NLSF_Q15[L-1], (1<<15) - NDeltaMin_Q15[L] );