diff --git a/pkgs/applications/editors/emacs-25/builder.sh b/pkgs/applications/editors/emacs-25/builder.sh
index 984a61df6f3..545520cca7c 100644
--- a/pkgs/applications/editors/emacs-25/builder.sh
+++ b/pkgs/applications/editors/emacs-25/builder.sh
@@ -5,6 +5,8 @@ source $stdenv/setup
 # *our* versions, not the ones found in the system, as it would do by default.
 # On other platforms, this appears to be unnecessary.
 preConfigure() {
+    ./autogen.sh
+
     for i in Makefile.in ./src/Makefile.in ./lib-src/Makefile.in ./leim/Makefile.in; do
         substituteInPlace $i --replace /bin/pwd pwd
     done