diff --git a/src/apprt/gtk/Surface.zig b/src/apprt/gtk/Surface.zig
index de0a8f812..936076e55 100644
--- a/src/apprt/gtk/Surface.zig
+++ b/src/apprt/gtk/Surface.zig
@@ -1935,6 +1935,14 @@ fn gtkInputPreeditChanged(
 ) callconv(.C) void {
     const self = userdataSelf(ud.?);
 
+    // Any preedit change should mark that we're composing. Its possible this
+    // is false using fcitx5-hangul and typing "dkssud<space>" ("안녕"). The
+    // second "s" results in a "commit" for "안" which sets composing to false,
+    // but then immediately sends a preedit change for the next symbol. With
+    // composing set to false we won't commit this text. Therefore, we must
+    // ensure it is set here.
+    self.im_composing = true;
+
     // Get our pre-edit string that we'll use to show the user.
     var buf: [*c]u8 = undefined;
     _ = c.gtk_im_context_get_preedit_string(ctx, &buf, null, null);