diff --git a/guix/build-system/gnu.scm b/guix/build-system/gnu.scm
index b2b184db3421ec0fa14a4ab284b27fe61b3c87a3..2c41ce0eb46d5557aeae606e45fa9f8a95ab7f0f 100644
--- a/guix/build-system/gnu.scm
+++ b/guix/build-system/gnu.scm
@@ -268,7 +268,8 @@ (define* (gnu-build store name source inputs
                     (out-of-source? #f)
                     (tests? #t)
                     (test-target "check")
-                    (parallel-build? #t) (parallel-tests? #t)
+                    (parallel-build? #t)
+                    (parallel-tests? #t)
                     (patch-shebangs? #t)
                     (strip-binaries? #t)
                     (strip-flags ''("--strip-debug"))
diff --git a/guix/build-system/perl.scm b/guix/build-system/perl.scm
index 56954911cb7a639983471146b0f400b95b51356a..e8fe2d56c8821b26c4702270519955a9fdc6006e 100644
--- a/guix/build-system/perl.scm
+++ b/guix/build-system/perl.scm
@@ -47,6 +47,8 @@ (define* (perl-build store name source inputs
                      (perl (default-perl))
                      (search-paths '())
                      (tests? #t)
+                     (parallel-build? #t)
+                     (parallel-tests? #t)
                      (make-maker-flags ''())
                      (phases '(@ (guix build perl-build-system)
                                  %standard-phases))
@@ -79,6 +81,8 @@ (define builder
                    #:system ,system
                    #:test-target "test"
                    #:tests? ,tests?
+                   #:parallel-build? ,parallel-build?
+                   #:parallel-tests? ,parallel-tests?
                    #:outputs %outputs
                    #:inputs %build-inputs)))