diff --git a/GNUmakefile b/GNUmakefile
index d5ea1940..1c2905d6 100755
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -785,7 +785,7 @@ distclean: clean
 	@-$(RM) cryptopp.tgz *.o *.bc *.ii *~
 	@-$(RM) -r $(SRCS:.cpp=.obj) cryptlib.lib cryptest.exe *.suo *.sdf *.pdb Win32/ x64/ ipch/
 	@-$(RM) -r $(DOCUMENT_DIRECTORY)/
-	@-$(RM) -rf Makefile.am configure.ac configure Makefile auto*.cache/
+	@-$(RM) -rf Makefile.am configure.ac aclocal.m4 depcomp missing install-sh configure Makefile auto*.cache/
 	@-$(RM) -r TestCoverage/
 	@-$(RM) cryptopp$(LIB_VER)\.*
 	@-$(RM) CryptoPPRef.zip
diff --git a/GNUmakefile-cross b/GNUmakefile-cross
index 71a745be..c3d0971f 100755
--- a/GNUmakefile-cross
+++ b/GNUmakefile-cross
@@ -336,7 +336,7 @@ distclean: clean
 	-$(RM) adhoc.cpp adhoc.cpp.copied cryptopp.mapfile GNUmakefile.deps benchmarks.html cryptest.txt cryptest-*.txt
 	@-$(RM) cryptopp.tgz *.o *.bc *.ii *~
 	@-$(RM) -r $(SRCS:.cpp=.obj) cryptlib.lib cryptest.exe *.suo *.sdf *.pdb Win32/ x64/ ipch/
-	@-$(RM) -rf Makefile.am configure.ac configure Makefile auto*.cache/
+	@-$(RM) -rf Makefile.am configure.ac aclocal.m4 depcomp missing install-sh configure Makefile auto*.cache/
 	@-$(RM) -r TestCoverage/
 	@-$(RM) cryptopp$(LIB_VER)\.*
 	@-$(RM) CryptoPPRef.zip