diff --git a/lib_enc/acelp_core_enc.c b/lib_enc/acelp_core_enc.c
index 55d21983df7946d0917a5a89fd255fa0ea748ae4..41a729dce4fd3a06d01e0a4262a5c1d2d0bc04a3 100644
--- a/lib_enc/acelp_core_enc.c
+++ b/lib_enc/acelp_core_enc.c
@@ -167,7 +167,10 @@ ivas_error acelp_core_enc(
     {
         st->Nb_ACELP_frames = 0;
     }
-    st->Nb_ACELP_frames++;
+    if ( st->Nb_ACELP_frames < MAX16B )
+    {
+        st->Nb_ACELP_frames++;
+    }
 
     if ( st->L_frame == L_FRAME )
     {