diff --git a/autogen.sh b/autogen.sh
index 3f608db3da..b3cbb38389 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -16,10 +16,14 @@ command -v autoreconf >/dev/null || \
 autoreconf --install --force --warnings=all
 
 if expr "'$(build-aux/config.guess --timestamp)" \< "'$(depends/config.guess --timestamp)" > /dev/null; then
+  chmod ug+w build-aux/config.guess
+  chmod ug+w src/secp256k1/build-aux/config.guess
   cp depends/config.guess build-aux
   cp depends/config.guess src/secp256k1/build-aux
 fi
 if expr "'$(build-aux/config.sub --timestamp)" \< "'$(depends/config.sub --timestamp)" > /dev/null; then
+  chmod ug+w build-aux/config.sub
+  chmod ug+w src/secp256k1/build-aux/config.sub
   cp depends/config.sub build-aux
   cp depends/config.sub src/secp256k1/build-aux
 fi