diff --git a/ChangeLog b/ChangeLog
index 88700563d..d0f13eb3d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2007-03-10  Jim Meyering  <jim@meyering.net>
+
+	* Makefile.maint (po-check): Exclude c99-to-c89.diff.
+
 2007-03-09  Jim Meyering  <jim@meyering.net>
 
 	Avoid test failures on Darwin 7.9.0 (MacOS X 10.3.9)
diff --git a/Makefile.maint b/Makefile.maint
index 0d86c6c23..c1da0d559 100644
--- a/Makefile.maint
+++ b/Makefile.maint
@@ -400,6 +400,7 @@ po-check:
 	  for file in $$($(CVS_LIST_EXCEPT)) lib/*.[ch]; do		\
 	    case $$file in						\
 	    djgpp/* | man/*) continue;;					\
+	    */c99-to-c89.diff) continue;;				\
 	    esac;							\
 	    case $$file in						\
 	    *.[ch])							\