diff --git a/gnu/packages/crates-io.scm b/gnu/packages/crates-io.scm
index 3bf098a53d..a6a363b6fd 100644
--- a/gnu/packages/crates-io.scm
+++ b/gnu/packages/crates-io.scm
@@ -77099,7 +77099,9 @@ (define-public rust-time-0.2
        (sha256
         (base32 "0hm209d078jfgxzjhi5xqim64q31rlj1h70zz57qbmpbirzsjlj7"))))
     (arguments
-     `(#:cargo-inputs
+     `(#:cargo-test-flags
+       '("--release" "--lib" "--bins" "--tests")
+       #:cargo-inputs
        (("rust-const-fn" ,rust-const-fn-0.4)
         ("rust-libc" ,rust-libc-0.2)
         ("rust-rand" ,rust-rand-0.7)