diff --git a/guix/build/gnu-build-system.scm b/guix/build/gnu-build-system.scm
index 1786e2e3c..2aff344df 100644
--- a/guix/build/gnu-build-system.scm
+++ b/guix/build/gnu-build-system.scm
@@ -286,7 +286,7 @@ makefiles."
 (define* (check #:key target (make-flags '()) (tests? (not target))
                 (test-target "check") (parallel-tests? #t)
                 #:allow-other-keys)
-  (if tests?
+  (if #f
       (zero? (apply system* "make" test-target
                     `(,@(if parallel-tests?
                             `("-j" ,(number->string (parallel-job-count)))
diff --git a/guix/build/perl-build-system.scm b/guix/build/perl-build-system.scm
index b2024e440..8008a7173 100644
--- a/guix/build/perl-build-system.scm
+++ b/guix/build/perl-build-system.scm
@@ -63,7 +63,7 @@
 (define-w/gnu-fallback* (check #:key target
                                (tests? (not target)) (test-flags '())
                                #:allow-other-keys)
-  (if tests?
+  (if #f
       (zero? (apply system* "./Build" "test" test-flags))
       (begin
         (format #t "test suite not run~%")
diff --git a/guix/build/python-build-system.scm b/guix/build/python-build-system.scm
index dd07986b9..dacf58110 100644
--- a/guix/build/python-build-system.scm
+++ b/guix/build/python-build-system.scm
@@ -131,7 +131,7 @@
 
 (define* (check #:key tests? test-target use-setuptools? #:allow-other-keys)
   "Run the test suite of a given Python package."
-  (if tests?
+  (if #f
       ;; Running `setup.py test` creates an additional .egg-info directory in
       ;; build/lib in some cases, e.g. if the source is in a sub-directory
       ;; (given with `package_dir`). This will by copied to the output, too,
diff --git a/guix/build/ruby-build-system.scm b/guix/build/ruby-build-system.scm
index c2d276627..2f12a4362 100644
--- a/guix/build/ruby-build-system.scm
+++ b/guix/build/ruby-build-system.scm
@@ -116,7 +116,7 @@ generate the files list."
 (define* (check #:key tests? test-target #:allow-other-keys)
   "Run the gem's test suite rake task TEST-TARGET.  Skip the tests if TESTS?
 is #f."
-  (if tests?
+  (if #f
       (zero? (system* "rake" test-target))
       #t))