diff --git a/util/ceg/defaults/mk_C_out b/util/ceg/defaults/mk_C_out
index e6cc5370..73432a75 100755
--- a/util/ceg/defaults/mk_C_out
+++ b/util/ceg/defaults/mk_C_out
@@ -1,5 +1,6 @@
 trap "rm -f tmp$$"  0 1 2 3 15
 cp $1 tmp$$
+chmod +w tmp$$
 ed - tmp$$ <<'EOF'
 /^#include "C_mnem_narg"/d
 .-1r C_mnem_narg
diff --git a/util/ceg/defaults/proto.make b/util/ceg/defaults/proto.make
index 3f4921a4..2e06364e 100644
--- a/util/ceg/defaults/proto.make
+++ b/util/ceg/defaults/proto.make
@@ -38,6 +38,8 @@ install:	all
 	for i in $(PseudoList) ; do cp $(SRC_DIR)/pseudo/$$i $(DEF)/pseudo/$$i ; done
 	for i in $(StorageList) ; do cp $(SRC_DIR)/storage/$$i $(DEF)/storage/$$i ; done
 	cp C_out.c $(DEF)/C_out.c
+	chmod +w $(DEF)/*
+	chmod +w $(DEF)/*/*
 
 cmp:	all
 	-cmp $(SRC_DIR)/pseudo_vars.c $(DEF)/pseudo_vars.c