diff --git a/cmake/cmake.h.in b/cmake/cmake.h.in
index cb389cb6..3d36b3d0 100644
--- a/cmake/cmake.h.in
+++ b/cmake/cmake.h.in
@@ -15,7 +15,6 @@
 #cmakedefine01 HAVE_GETNAMEDPIPECLIENTPROCESSID
 #cmakedefine01 HAVE_SETDEFAULTDLLDIRECTORIES
 #cmakedefine01 HAVE_STRTOUMAX
-#cmakedefine01 HAVE_WMEMCHR
 #cmakedefine01 HAVE_DWMAPI_H
 
 #cmakedefine NOT_X_WINDOWS
diff --git a/cmake/platforms/windows.cmake b/cmake/platforms/windows.cmake
index e87f3380..481809ec 100644
--- a/cmake/platforms/windows.cmake
+++ b/cmake/platforms/windows.cmake
@@ -53,7 +53,6 @@ define_negation(NO_HTMLHELP HAVE_HTMLHELP_H)
 check_include_files("winsock2.h;afunix.h" HAVE_AFUNIX_H)
 
 check_symbol_exists(strtoumax "inttypes.h" HAVE_STRTOUMAX)
-check_symbol_exists(wmemchr "wchar.h" HAVE_WMEMCHR)
 check_symbol_exists(AddDllDirectory "windows.h" HAVE_ADDDLLDIRECTORY)
 check_symbol_exists(SetDefaultDllDirectories "windows.h"
   HAVE_SETDEFAULTDLLDIRECTORIES)
diff --git a/defs.h b/defs.h
index 0e56eb78..0ac23ee2 100644
--- a/defs.h
+++ b/defs.h
@@ -53,11 +53,6 @@ uintmax_t strtoumax(const char *nptr, char **endptr, int base);
 #define SIZEu "zu"
 #endif
 
-#if !HAVE_WMEMCHR
-/* Work around lack of wmemchr in older MSVC */
-wchar_t *wmemchr(const wchar_t *s, wchar_t c, size_t n);
-#endif
-
 #if defined __GNUC__ || defined __clang__
 /*
  * On MinGW, the correct compiler format checking for vsnprintf() etc
diff --git a/windows/CMakeLists.txt b/windows/CMakeLists.txt
index 7d4fcadb..960a440d 100644
--- a/windows/CMakeLists.txt
+++ b/windows/CMakeLists.txt
@@ -42,9 +42,6 @@ add_sources_from_current_dir(utils
 if(NOT HAVE_STRTOUMAX)
   add_sources_from_current_dir(utils utils/strtoumax.c)
 endif()
-if(NOT HAVE_WMEMCHR)
-  add_sources_from_current_dir(utils utils/wmemchr.c)
-endif()
 add_sources_from_current_dir(eventloop
   cliloop.c handle-wait.c)
 add_sources_from_current_dir(console
diff --git a/windows/utils/wmemchr.c b/windows/utils/wmemchr.c
deleted file mode 100644
index 7ccdfe3c..00000000
--- a/windows/utils/wmemchr.c
+++ /dev/null
@@ -1,15 +0,0 @@
-/*
- * Work around lack of wmemchr in older MSVC libraries.
- */
-
-#include <wchar.h>
-
-#include "defs.h"
-
-wchar_t *wmemchr(const wchar_t *s, wchar_t c, size_t n)
-{
-    for (; n != 0; s++, n--)
-        if (*s == c)
-            return (wchar_t *)s;
-    return NULL;
-}