diff --git a/cmake/ConfigureChecks.cmake b/cmake/ConfigureChecks.cmake
index 2e2d5e567..b685a5c0f 100644
--- a/cmake/ConfigureChecks.cmake
+++ b/cmake/ConfigureChecks.cmake
@@ -128,9 +128,7 @@ check_cxx_symbol_exists(eventfd sys/eventfd.h HAVE_EVENTFD)
 check_cxx_symbol_exists(pipe2 unistd.h HAVE_PIPE2)
 check_cxx_symbol_exists(wcscasecmp wchar.h HAVE_WCSCASECMP)
 check_cxx_symbol_exists(wcsdup wchar.h HAVE_WCSDUP)
-check_cxx_symbol_exists(wcslcpy wchar.h HAVE_WCSLCPY)
 check_cxx_symbol_exists(wcsncasecmp wchar.h HAVE_WCSNCASECMP)
-check_cxx_symbol_exists(wcsndup wchar.h HAVE_WCSNDUP)
 
 # These are for compatibility with Solaris 10, which places the following
 # in the std namespace.
diff --git a/config_cmake.h.in b/config_cmake.h.in
index 73571fc04..50caf6231 100644
--- a/config_cmake.h.in
+++ b/config_cmake.h.in
@@ -100,15 +100,9 @@
 /* Define to 1 if you have the `wcsdup' function. */
 #cmakedefine HAVE_WCSDUP 1
 
-/* Define to 1 if you have the `wcslcpy' function. */
-#cmakedefine HAVE_WCSLCPY 1
-
 /* Define to 1 if you have the `wcsncasecmp' function. */
 #cmakedefine HAVE_WCSNCASECMP 1
 
-/* Define to 1 if you have the `wcsndup' function. */
-#cmakedefine HAVE_WCSNDUP 1
-
 /* Define to 1 if you have the `wcstod_l' function. */
 #cmakedefine HAVE_WCSTOD_L 1
 
diff --git a/src/fallback.cpp b/src/fallback.cpp
index d0c1c2e63..8746e1243 100644
--- a/src/fallback.cpp
+++ b/src/fallback.cpp
@@ -125,57 +125,6 @@ int wcsncasecmp(const wchar_t *a, const wchar_t *b, size_t n) {
 #endif
 #endif
 
-#ifndef HAVE_WCSNDUP
-wchar_t *wcsndup(const wchar_t *in, size_t c) {
-    auto res = static_cast<wchar_t *>(malloc(sizeof(wchar_t) * (c + 1)));
-    if (res == nullptr) {
-        return nullptr;
-    }
-    wcslcpy(res, in, c + 1);
-    return res;
-}
-#endif
-
-#ifndef HAVE_WCSLCPY
-/*$OpenBSD: strlcpy.c,v 1.8 2003/06/17 21:56:24 millert Exp $*/
-
-/*
- * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
- *
- * Permission to use, copy, modify, and distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- */
-size_t wcslcpy(wchar_t *dst, const wchar_t *src, size_t siz) {
-    wchar_t *d = dst;
-    const wchar_t *s = src;
-    size_t n = siz;
-
-    // Copy as many bytes as will fit.
-    if (n != 0 && --n != 0) {
-        do {
-            if ((*d++ = *s++) == 0) break;
-        } while (--n != 0);
-    }
-
-    // Not enough room in dst, add NUL and traverse rest of src.
-    if (n == 0) {
-        if (siz != 0) *d = '\0';  // NUL-terminate dst
-        while (*s++)
-            ;  // ignore rest of src
-    }
-    return s - src - 1;  // count does not include NUL
-}
-#endif
-
 #if HAVE_GETTEXT
 char *fish_gettext(const char *msgid) { return gettext(msgid); }
 
diff --git a/src/fallback.h b/src/fallback.h
index 7a212c687..043eea2d7 100644
--- a/src/fallback.h
+++ b/src/fallback.h
@@ -109,20 +109,6 @@ int wcsncasecmp(const wchar_t *s1, const wchar_t *s2, size_t n);
 #endif
 #endif
 
-#ifndef HAVE_WCSNDUP
-/// Fallback for wcsndup function. Returns a copy of \c in, truncated to a maximum length of \c c.
-wchar_t *wcsndup(const wchar_t *in, size_t c);
-#endif
-
-#ifndef HAVE_WCSLCPY
-/// Copy src to string dst of size siz.  At most siz-1 characters will be copied.  Always NUL
-/// terminates (unless siz == 0).  Returns std::wcslen(src); if retval >= siz, truncation occurred.
-///
-/// This is the OpenBSD strlcpy function, modified for wide characters, and renamed to reflect this
-/// change.
-size_t wcslcpy(wchar_t *dst, const wchar_t *src, size_t siz);
-#endif
-
 // autoconf may fail to detect gettext (645), so don't define a function call gettext or we'll get
 // build errors.