diff --git a/pjmedia/src/pjmedia-codec/gsm.c b/pjmedia/src/pjmedia-codec/gsm.c
index c909339bf..c1e769bcb 100644
--- a/pjmedia/src/pjmedia-codec/gsm.c
+++ b/pjmedia/src/pjmedia-codec/gsm.c
@@ -122,8 +122,8 @@ static struct gsm_codec_factory
 /* GSM codec private data. */
 struct gsm_data
 {
-    gsm_state		*encoder;
-    gsm_state		*decoder;
+    struct gsm_state	*encoder;
+    struct gsm_state	*decoder;
     pj_bool_t		 plc_enabled;
 #if !PLC_DISABLED
     pjmedia_plc		*plc;