diff --git a/include/fts.h b/include/fts.h
index dbf82c99167f..20dfbfea3c95 100644
--- a/include/fts.h
+++ b/include/fts.h
@@ -37,8 +37,6 @@
 #ifndef	_FTS_H_
 #define	_FTS_H_
 
-struct _fts_private;			/* implementation data */
-
 typedef struct {
 	struct _ftsent *fts_cur;	/* current node */
 	struct _ftsent *fts_child;	/* linked list of children */
@@ -65,7 +63,7 @@ typedef struct {
 #define	FTS_STOP	0x200		/* (private) unrecoverable error */
 	int fts_options;		/* fts_open options, global flags */
 	void *fts_clientptr;		/* thunk for sort function */
-	struct _fts_private *fts_priv;	/* Implementation data */
+	struct _fts_private *fts_priv;	/* implementation data */
 } FTS;
 
 typedef struct _ftsent {
diff --git a/lib/libc/gen/fts-compat.h b/lib/libc/gen/fts-compat.h
index dbf82c99167f..20dfbfea3c95 100644
--- a/lib/libc/gen/fts-compat.h
+++ b/lib/libc/gen/fts-compat.h
@@ -37,8 +37,6 @@
 #ifndef	_FTS_H_
 #define	_FTS_H_
 
-struct _fts_private;			/* implementation data */
-
 typedef struct {
 	struct _ftsent *fts_cur;	/* current node */
 	struct _ftsent *fts_child;	/* linked list of children */
@@ -65,7 +63,7 @@ typedef struct {
 #define	FTS_STOP	0x200		/* (private) unrecoverable error */
 	int fts_options;		/* fts_open options, global flags */
 	void *fts_clientptr;		/* thunk for sort function */
-	struct _fts_private *fts_priv;	/* Implementation data */
+	struct _fts_private *fts_priv;	/* implementation data */
 } FTS;
 
 typedef struct _ftsent {