diff --git a/CMake/Platforms/WindowsCache.cmake b/CMake/Platforms/WindowsCache.cmake
index 0997ef3e15..077bed228e 100644
--- a/CMake/Platforms/WindowsCache.cmake
+++ b/CMake/Platforms/WindowsCache.cmake
@@ -148,7 +148,6 @@ set(HAVE_TERMIO_H 0)
 set(HAVE_LINUX_TCP_H 0)
 
 set(HAVE_FSEEKO 0)  # mingw-w64 2.0.0 and newer has it
-set(HAVE__FSEEKI64 1)
 set(HAVE_SOCKET 1)
 set(HAVE_SELECT 1)
 set(HAVE_STRDUP 1)
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4dbd2df2ad..b8b80dc7c6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1570,7 +1570,6 @@ check_symbol_exists("freeaddrinfo"    "${CURL_INCLUDES}" HAVE_FREEADDRINFO)  # w
 check_function_exists("pipe"          HAVE_PIPE)
 check_function_exists("eventfd"       HAVE_EVENTFD)
 check_symbol_exists("ftruncate"       "unistd.h" HAVE_FTRUNCATE)
-check_function_exists("_fseeki64"     HAVE__FSEEKI64)
 check_symbol_exists("getpeername"     "${CURL_INCLUDES}" HAVE_GETPEERNAME)  # winsock2.h unistd.h proto/bsdsocket.h
 check_symbol_exists("getsockname"     "${CURL_INCLUDES}" HAVE_GETSOCKNAME)  # winsock2.h unistd.h proto/bsdsocket.h
 check_function_exists("if_nametoindex"  HAVE_IF_NAMETOINDEX)  # winsock2.h net/if.h
diff --git a/configure.ac b/configure.ac
index a8bd87e736..99ce9a4ff6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -4100,7 +4100,6 @@ AC_CHECK_DECLS([getpwuid_r], [], [AC_DEFINE(HAVE_DECL_GETPWUID_R_MISSING, 1, "Se
           #include <sys/types.h>]])
 
 AC_CHECK_FUNCS([\
-  _fseeki64 \
   eventfd \
   fnmatch \
   geteuid \
diff --git a/lib/config-win32.h b/lib/config-win32.h
index e6abf06215..2daed912d0 100644
--- a/lib/config-win32.h
+++ b/lib/config-win32.h
@@ -427,10 +427,6 @@ Vista
 #  endif
 #endif
 
-#ifdef USE_WIN32_LARGE_FILES
-#define HAVE__FSEEKI64
-#endif
-
 /* Define to the size of `off_t', as computed by sizeof. */
 #if defined(__MINGW32__) && \
   defined(_FILE_OFFSET_BITS) && (_FILE_OFFSET_BITS == 64)
diff --git a/lib/curl_config.h.cmake b/lib/curl_config.h.cmake
index 7ee0a400f7..1ac59ff057 100644
--- a/lib/curl_config.h.cmake
+++ b/lib/curl_config.h.cmake
@@ -246,9 +246,6 @@
 /* Define to 1 if you have the fseeko declaration. */
 #cmakedefine HAVE_DECL_FSEEKO 1
 
-/* Define to 1 if you have the _fseeki64 function. */
-#cmakedefine HAVE__FSEEKI64 1
-
 /* Define to 1 if you have the ftruncate function. */
 #cmakedefine HAVE_FTRUNCATE 1
 
diff --git a/lib/formdata.c b/lib/formdata.c
index cea61b22e1..7ea7a8f396 100644
--- a/lib/formdata.c
+++ b/lib/formdata.c
@@ -793,7 +793,7 @@ static CURLcode setname(curl_mimepart *part, const char *name, size_t len)
 /* wrap call to fseeko so it matches the calling convention of callback */
 static int fseeko_wrapper(void *stream, curl_off_t offset, int whence)
 {
-#if defined(HAVE__FSEEKI64)
+#if defined(_WIN32) && defined(USE_WIN32_LARGE_FILES)
   return _fseeki64(stream, (__int64)offset, whence);
 #elif defined(HAVE_FSEEKO) && defined(HAVE_DECL_FSEEKO)
   return fseeko(stream, (off_t)offset, whence);