diff --git a/configure.ac b/configure.ac
index e5dc838..fb2d74a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -110,6 +110,7 @@ AC_PROG_CC
 LT_PROG_RC
 
 
+
 ### Checks for libraries
 
 # Evil library for compilation on Windows
@@ -230,6 +231,8 @@ AC_SUBST(lt_enable_auto_import)
 
 ### Checks for library functions
 
+AC_CHECK_FUNCS([sync])
+
 
 AC_OUTPUT([
 Makefile
diff --git a/src/bin/ui.c b/src/bin/ui.c
index 9d912ad..3dd05a5 100644
--- a/src/bin/ui.c
+++ b/src/bin/ui.c
@@ -611,7 +611,7 @@ _ui_setup(void)
 #undef UI
    _ui_menu_item_add("exit.png", "Exit", _ui_exit);
 
-#ifndef _WIN32
+#ifdef HAVE_SYNC
    /* make sure disk io isn't going to turn up unexpectedly */
    sync();
    sync();