diff --git a/glib-formatstring.patch b/glib-formatstring.patch
new file mode 100644
index 0000000..8977fab
--- /dev/null
+++ b/glib-formatstring.patch
@@ -0,0 +1,11 @@
+--- glib/tests/gdatetime.c.orig	2013-02-22 19:12:04.254926898 +0100
++++ glib/tests/gdatetime.c	2013-02-22 19:42:53.195159124 +0100
+@@ -844,7 +844,7 @@
+   tt.tm_min = 0;
+   tt.tm_hour = 0;
+   t = mktime (&tt);
+-  g_sprintf (t_str, "%ld", t);
++  g_sprintf (t_str, "%ld", (long int)t);
+ 
+   TEST_PRINTF ("%a", "Sat");
+   TEST_PRINTF ("%A", "Saturday");
diff --git a/mingw-glib2.spec b/mingw-glib2.spec
index c5a683d..bc29781 100644
--- a/mingw-glib2.spec
+++ b/mingw-glib2.spec
@@ -55,6 +55,8 @@ Patch2:         glib-build-dbus-proxy-testcase-only-on-unix.patch
 # https://bugzilla.gnome.org/show_bug.cgi?id=692085
 Patch3:         glib-send-log-messages-to-correct-stdout-and-stderr.patch
 
+Patch4:         glib-formatstring.patch
+
 %description
 MinGW Windows Glib2 library.
 
@@ -98,6 +100,7 @@ Static version of the MinGW Windows GLib2 library.
 %patch1 -p1
 %patch2 -p1
 %patch3 -p0
+%patch4 -p0
 
 autoreconf -i --force