diff --git a/ANNOUNCE b/ANNOUNCE
index d2e8697f4..410fd26ce 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -93,6 +93,7 @@ Version 1.6.17rc05 [March 21, 2015]
     the Coverity scan without them.
 
 Version 1.6.17rc06 [March 21, 2015]
+  Remove pnglibconf.dfn and pnglibconf.pre with "make clean".
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
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diff --git a/CHANGES b/CHANGES
index 402b1a4c2..ad382b577 100644
--- a/CHANGES
+++ b/CHANGES
@@ -5194,6 +5194,7 @@ Version 1.6.17rc05 [March 21, 2015]
     the Coverity scan without them.
 
 Version 1.6.17rc06 [March 21, 2015]
+  Remove pnglibconf.dfn and pnglibconf.pre with "make clean".
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
diff --git a/Makefile.am b/Makefile.am
index 6772afc51..ac5f95cf7 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -134,7 +134,7 @@ SCRIPT_CLEANFILES=scripts/*.out scripts/*.chk
 CLEANFILES= *.tf? pngout.png libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.pc \
 	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@-config libpng.vers libpng.sym \
 	check.new pnglibconf.h pngprefix.h symbols.new pngtest-log.txt \
-	pnglibconf.out pnglibconf.c \
+	pnglibconf.out pnglibconf.c pnglibconf.pre pnglibconf.dfn \
 	$(SCRIPT_CLEANFILES)
 
 MAINTAINERCLEANFILES = Makefile.in aclocal.m4 config.guess config.h.in \