diff --git a/lib/config-win32.h b/lib/config-win32.h
index 031eda54a5..73ac8a08ed 100644
--- a/lib/config-win32.h
+++ b/lib/config-win32.h
@@ -136,6 +136,12 @@
 /* Define if you don't have vprintf but do have _doprnt.  */
 /* #define HAVE_DOPRNT 1 */
 
+/* Define if you have the fflush function.  */
+#define HAVE_FFLUSH 1
+
+/* Define if you have the fsync function.  */
+/* #define HAVE_FSYNC 1 */
+
 /* Define if you have the gethostbyaddr function.  */
 #define HAVE_GETHOSTBYADDR 1
 
diff --git a/lib/config-win32ce.h b/lib/config-win32ce.h
index 6c0fb411f6..715f1c3e64 100644
--- a/lib/config-win32ce.h
+++ b/lib/config-win32ce.h
@@ -127,6 +127,14 @@
 /* Define if you don't have vprintf but do have _doprnt.  */
 /* #define HAVE_DOPRNT 1 */
 
+/* Define if you have the fflush function.  */
+#if defined(_WIN32_WCE) && (_WIN32_WCE >= 200)
+#  define HAVE_FFLUSH 1
+#endif
+
+/* Define if you have the fsync function.  */
+/* #define HAVE_FSYNC 1 */
+
 /* Define if you have the gethostbyaddr function.  */
 #define HAVE_GETHOSTBYADDR 1
 
diff --git a/src/config-win32.h b/src/config-win32.h
index 6aaac00327..92be57479d 100644
--- a/src/config-win32.h
+++ b/src/config-win32.h
@@ -75,6 +75,12 @@
 /* Define if you have the setmode function. */
 #define HAVE_SETMODE 1
 
+/* Define if you have the fflush function.  */
+#define HAVE_FFLUSH 1
+
+/* Define if you have the fsync function.  */
+/* #define HAVE_FSYNC 1 */
+
 /* Define if you have the ftruncate function.  */
 #define HAVE_FTRUNCATE 1