diff --git a/src/modules/audio_coding/codecs/iSAC/fix/source/isacfix.gypi b/src/modules/audio_coding/codecs/iSAC/fix/source/isacfix.gypi
index f87b26f42d..a13d1f568e 100644
--- a/src/modules/audio_coding/codecs/iSAC/fix/source/isacfix.gypi
+++ b/src/modules/audio_coding/codecs/iSAC/fix/source/isacfix.gypi
@@ -40,6 +40,7 @@
         'initialize.c',
         'isacfix.c',
         'lattice.c',
+        'lattice_c.c',
         'lpc_masking_model.c',
         'lpc_tables.c',
         'pitch_estimator.c',