diff --git a/gdb/testsuite/gdb.threads/Makefile.in b/gdb/testsuite/gdb.threads/Makefile.in
index df70a51..954d547 100644
--- a/gdb/testsuite/gdb.threads/Makefile.in
+++ b/gdb/testsuite/gdb.threads/Makefile.in
@@ -16,7 +16,8 @@ all info install-info dvi install uninstall installcheck check:
 	@echo "Nothing to be done for $@..."
 
 clean mostlyclean:
-	-rm -f *~ *.o a.out xgdb *.x *.ci *.tmp core* $(EXECUTABLES) gcore.test
+	-rm -f *~ *.o a.out xgdb *.x *.ci *.tmp core core.* $(EXECUTABLES) \
+	 *.core gcore.test
 
 distclean maintainer-clean realclean: clean
 	-rm -f Makefile config.status config.log config.h gdb.log gdb.sum