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-rw-r--r--src/if_mzsch.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/if_mzsch.c b/src/if_mzsch.c
index 1861df49a0..37cebc553a 100644
--- a/src/if_mzsch.c
+++ b/src/if_mzsch.c
@@ -849,7 +849,7 @@ static long range_end;
static int mz_threads_allow = 0;
#if defined(FEAT_GUI_W32)
-static void CALLBACK timer_proc(HWND, UINT, UINT, DWORD);
+static void CALLBACK timer_proc(HWND, UINT, UINT_PTR, DWORD);
static UINT timer_id = 0;
#elif defined(FEAT_GUI_GTK)
# if GTK_CHECK_VERSION(3,0,0)