diff --git a/guix/import/crate/cargo-lock.scm b/guix/import/crate/cargo-lock.scm
index 44e4053334..b03050a244 100644
--- a/guix/import/crate/cargo-lock.scm
+++ b/guix/import/crate/cargo-lock.scm
@@ -72,7 +72,7 @@
 (define-peg-pattern crate-source all
   (and (or "registry" "git")
        "+https://"
-       (+ (or "/" "." "?" "=" "-" "#" "_" "~"
+       (+ (or "/" "." "?" "=" "-" "#" "_" "~" "%"
               alphanumeric-char))))
 
 ;; checksum