diff --git a/modules/im/ximcp/imDefFlt.c b/modules/im/ximcp/imDefFlt.c
index f07d4187..9bd4f97f 100644
--- a/modules/im/ximcp/imDefFlt.c
+++ b/modules/im/ximcp/imDefFlt.c
@@ -145,7 +145,7 @@ _XimProtoKeypressFilter(
 
     if (_XimIsFabricatedSerial(im, ev)) {
 	_XimPendingFilter(ic);
-	_XimUnfabricateSerial(im, ev);
+	_XimUnfabricateSerial(im, ic, ev);
 	return NOTFILTERD;
     }
     /* w=0 is used for _XimIsFabricatedSerial() only */
@@ -210,7 +210,7 @@ _XimProtoKeyreleaseFilter(
 
     if (_XimIsFabricatedSerial(im, ev)) {
 	_XimPendingFilter(ic);
-	_XimUnfabricateSerial(im, ev);
+	_XimUnfabricateSerial(im, ic, ev);
 	return NOTFILTERD;
     }
     /* w=0 is used for _XimIsFabricatedSerial() only */
diff --git a/modules/im/ximcp/imDefLkup.c b/modules/im/ximcp/imDefLkup.c
index e25a2258..2e53ab23 100644
--- a/modules/im/ximcp/imDefLkup.c
+++ b/modules/im/ximcp/imDefLkup.c
@@ -367,10 +367,20 @@ _XimFabricateSerial(
 Bool
 _XimUnfabricateSerial(
     Xim			 im,
+    Xic			 ic,
     XKeyEvent		*event)
 {
+    if (!im->private.proto.enable_fabricated_order) {
+	UNMARK_FABRICATED(im);
+	return True;
+    }
     /* GTK2 XIM module sets serial=0. */
-    if (!event->serial || !im->private.proto.enable_fabricated_order) {
+    if (!event->serial) {
+	/* _XimCommitRecv() sets event->serial and call _XimFabricateSerial()
+	 * but GTK2 XIM always reset event->serial=0 with XFilterEvent().
+	 */
+	if (ic && ic->private.proto.commit_info)
+	    im->private.proto.fabricated_serial = 0;
 	UNMARK_FABRICATED(im);
 	return True;
     }
diff --git a/src/xlibi18n/XimintP.h b/src/xlibi18n/XimintP.h
index 3edd2102..1afa3c75 100644
--- a/src/xlibi18n/XimintP.h
+++ b/src/xlibi18n/XimintP.h
@@ -319,6 +319,7 @@ _XimFabricateSerial(
 Bool
 _XimUnfabricateSerial(
     Xim                  im,
+    Xic                  ic,
     XKeyEvent           *event);
 
 Bool