diff --git a/zilti/build-system/chicken.scm b/zilti/build-system/chicken.scm
index 72fa28d..87668db 100644
--- a/zilti/build-system/chicken.scm
+++ b/zilti/build-system/chicken.scm
@@ -95,7 +95,7 @@ EXTENSION is the file name extension, such as '.tar.gz'."
 
 (define* (chicken-build name inputs
                         #:key source
-                        (tests? #t)
+                        (tests? #f)
                         (parallel-build? #f)
                         (build-flags ''())
                         (configure-flags ''())