diff --git a/pjmedia/src/pjmedia-codec/ilbc/StateConstructW.h b/pjmedia/src/pjmedia-codec/ilbc/StateConstructW.h
new file mode 100644
index 0000000..08f93d2
--- /dev/null
+++ b/pjmedia/src/pjmedia-codec/ilbc/StateConstructW.h
@@ -0,0 +1,31 @@
+
+   /******************************************************************
+
+       iLBC Speech Coder ANSI-C Source Code
+
+       StateConstructW.h
+
+
+
+
+
+
+       Copyright (C) The Internet Society (2004).
+       All Rights Reserved.
+
+   ******************************************************************/
+
+   #ifndef __iLBC_STATECONSTRUCTW_H
+   #define __iLBC_STATECONSTRUCTW_H
+
+   void StateConstructW(
+       int idxForMax,      /* (i) 6-bit index for the quantization of
+                                  max amplitude */
+       int *idxVec,    /* (i) vector of quantization indexes */
+       float *syntDenum,   /* (i) synthesis filter denumerator */
+       float *out,         /* (o) the decoded state vector */
+       int len             /* (i) length of a state vector */
+   );
+
+   #endif
+