diff --git a/include/sys/u8_textprep.h b/include/sys/u8_textprep.h
deleted file mode 100644
index c8f6e4fe4..000000000
--- a/include/sys/u8_textprep.h
+++ /dev/null
@@ -1,44 +0,0 @@
-#ifndef _SPL_U8_TEXTPREP_H
-#define _SPL_U8_TEXTPREP_H
-
-#define U8_STRCMP_CS                    (0x00000001)
-#define U8_STRCMP_CI_UPPER              (0x00000002)
-#define U8_STRCMP_CI_LOWER              (0x00000004)
-
-#define U8_CANON_DECOMP                 (0x00000010)
-#define U8_COMPAT_DECOMP                (0x00000020)
-#define U8_CANON_COMP                   (0x00000040)
-
-#define U8_STRCMP_NFD                   (U8_CANON_DECOMP)
-#define U8_STRCMP_NFC                   (U8_CANON_DECOMP | U8_CANON_COMP)
-#define U8_STRCMP_NFKD                  (U8_COMPAT_DECOMP)
-#define U8_STRCMP_NFKC                  (U8_COMPAT_DECOMP | U8_CANON_COMP)
-
-#define U8_TEXTPREP_TOUPPER             (U8_STRCMP_CI_UPPER)
-#define U8_TEXTPREP_TOLOWER             (U8_STRCMP_CI_LOWER)
-
-#define U8_TEXTPREP_NFD                 (U8_STRCMP_NFD)
-#define U8_TEXTPREP_NFC                 (U8_STRCMP_NFC)
-#define U8_TEXTPREP_NFKD                (U8_STRCMP_NFKD)
-#define U8_TEXTPREP_NFKC                (U8_STRCMP_NFKC)
-
-#define U8_TEXTPREP_IGNORE_NULL         (0x00010000)
-#define U8_TEXTPREP_IGNORE_INVALID      (0x00020000)
-#define U8_TEXTPREP_NOWAIT              (0x00040000)
-
-#define U8_UNICODE_320                  (0)
-#define U8_UNICODE_500                  (1)
-#define U8_UNICODE_LATEST               (U8_UNICODE_500)
-
-#define U8_VALIDATE_ENTIRE              (0x00100000)
-#define U8_VALIDATE_CHECK_ADDITIONAL    (0x00200000)
-#define U8_VALIDATE_UCS2_RANGE          (0x00400000)
-
-#define U8_ILLEGAL_CHAR                 (-1)
-#define U8_OUT_OF_RANGE_CHAR            (-2)
-
-extern int u8_validate(char *, size_t, char **, int, int *);
-extern int u8_strcmp(const char *, const char *, size_t, int, size_t, int *);
-extern size_t u8_textprep_str(char *, size_t *, char *, size_t *, int, size_t, int *);
-
-#endif /* SPL_U8_TEXTPREP_H */