diff --git a/test/afilter-test.rkt b/test/afilter-test.rkt
index ec698e5..156aac7 100644
--- a/test/afilter-test.rkt
+++ b/test/afilter-test.rkt
@@ -25,5 +25,5 @@
 
 (check-exn
    exn:fail?
-   (f '(1))
+   (lambda () (f '(1)))
    "To get 100% code coverage for the f function.")
diff --git a/test/amap-test.rkt b/test/amap-test.rkt
index 1b3a928..14700db 100644
--- a/test/amap-test.rkt
+++ b/test/amap-test.rkt
@@ -23,5 +23,5 @@
 
 (check-exn
    exn:fail?
-   (f '(1))
+   (lambda () (f '(1)))
    "To get 100% code coverage for the f function.")