diff --git a/src/environment/jbuild b/src/environment/jbuild
index 6106ccbb5..59b41aa56 100644
--- a/src/environment/jbuild
+++ b/src/environment/jbuild
@@ -45,7 +45,7 @@
   ))
   (action
     (with-stdout-to ${@}
-      (run ${exe:sigs_packer/sigs_packer.exe} ${!^})))))
+      (chdir ${ROOT} (run ${exe:sigs_packer/sigs_packer.exe} ${!^}))))))
 
 (library
  ((name tezos_protocol_environment_sigs)