diff --git a/configure b/configure
index 1adbf1789f3..4306ea70100 100755
--- a/configure
+++ b/configure
@@ -18008,6 +18008,7 @@ for ac_func in \
 	poll \
 	port_create \
 	posix_fadvise \
+	posix_fallocate \
 	prctl \
 	proc_pidinfo \
 	readlink \
@@ -18600,40 +18601,6 @@ $as_echo "#define HAVE_SCHED_SETAFFINITY 1" >>confdefs.h
 
 fi
 
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for fallocate" >&5
-$as_echo_n "checking for fallocate... " >&6; }
-if ${wine_cv_have_fallocate+:} false; then :
-  $as_echo_n "(cached) " >&6
-else
-  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-#define _GNU_SOURCE
-#include <fcntl.h>
-int
-main ()
-{
-fallocate(-1, 0, 0, 0);
-  ;
-  return 0;
-}
-_ACEOF
-if ac_fn_c_try_link "$LINENO"; then :
-  wine_cv_have_fallocate=yes
-else
-  wine_cv_have_fallocate=no
-fi
-rm -f core conftest.err conftest.$ac_objext \
-    conftest$ac_exeext conftest.$ac_ext
-fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $wine_cv_have_fallocate" >&5
-$as_echo "$wine_cv_have_fallocate" >&6; }
-if test "$wine_cv_have_fallocate" = "yes"
-then
-
-$as_echo "#define HAVE_FALLOCATE 1" >>confdefs.h
-
-fi
-
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for inline" >&5
 $as_echo_n "checking for inline... " >&6; }
diff --git a/configure.ac b/configure.ac
index eb970972936..6ca4eb5c923 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2182,6 +2182,7 @@ AC_CHECK_FUNCS(\
 	poll \
 	port_create \
 	posix_fadvise \
+	posix_fallocate \
 	prctl \
 	proc_pidinfo \
 	readlink \
@@ -2273,15 +2274,6 @@ then
   AC_DEFINE(HAVE_SCHED_SETAFFINITY, 1, [Define to 1 if you have the `sched_setaffinity' function.])
 fi
 
-AC_CACHE_CHECK([for fallocate],wine_cv_have_fallocate,
-                AC_LINK_IFELSE([AC_LANG_PROGRAM(
-[[#define _GNU_SOURCE
-#include <fcntl.h>]], [[fallocate(-1, 0, 0, 0);]])],[wine_cv_have_fallocate=yes],[wine_cv_have_fallocate=no]))
-if test "$wine_cv_have_fallocate" = "yes"
-then
-  AC_DEFINE(HAVE_FALLOCATE, 1, [Define to 1 if you have the `fallocate' function.])
-fi
-
 dnl **** Check for types ****
 
 AC_C_INLINE
diff --git a/dlls/ntdll/unix/file.c b/dlls/ntdll/unix/file.c
index bcd74c9d6aa..e6f813966a5 100644
--- a/dlls/ntdll/unix/file.c
+++ b/dlls/ntdll/unix/file.c
@@ -4494,14 +4494,15 @@ NTSTATUS WINAPI NtSetInformationFile( HANDLE handle, IO_STATUS_BLOCK *io,
                 status = STATUS_INVALID_PARAMETER;
             else
             {
-#ifdef HAVE_FALLOCATE
-                if (fallocate( fd, 0, 0, (off_t)info->ValidDataLength.QuadPart ) == -1)
+#ifdef HAVE_POSIX_FALLOCATE
+                int err;
+                if ((err = posix_fallocate( fd, 0, (off_t)info->ValidDataLength.QuadPart )) != 0)
                 {
-                    if (errno == EOPNOTSUPP) WARN( "fallocate not supported on this filesystem\n" );
-                    else status = errno_to_status( errno );
+                    if (err == EOPNOTSUPP) WARN( "posix_fallocate not supported on this filesystem\n" );
+                    else status = errno_to_status( err );
                 }
 #else
-                FIXME( "setting valid data length not supported\n" );
+                WARN( "setting valid data length not supported\n" );
 #endif
             }
             if (needs_close) close( fd );
diff --git a/include/config.h.in b/include/config.h.in
index 9f8e7f34ada..f66444fd715 100644
--- a/include/config.h.in
+++ b/include/config.h.in
@@ -83,9 +83,6 @@
 /* Define to 1 if you have the `F3DAudioInitialize8' function. */
 #undef HAVE_F3DAUDIOINITIALIZE8
 
-/* Define to 1 if you have the `fallocate' function. */
-#undef HAVE_FALLOCATE
-
 /* Define to 1 if you have the `FAudioCreateReverb9WithCustomAllocatorEXT'
    function. */
 #undef HAVE_FAUDIOCREATEREVERB9WITHCUSTOMALLOCATOREXT
@@ -507,6 +504,9 @@
 /* Define to 1 if you have the `posix_fadvise' function. */
 #undef HAVE_POSIX_FADVISE
 
+/* Define to 1 if you have the `posix_fallocate' function. */
+#undef HAVE_POSIX_FALLOCATE
+
 /* Define to 1 if you have the `prctl' function. */
 #undef HAVE_PRCTL