diff --git a/tests/hello.scm b/tests/hello.scm
index b8a1374..dc3b997 100644
--- a/tests/hello.scm
+++ b/tests/hello.scm
@@ -3,5 +3,5 @@
         (foreign c))
 
 (define-c-procedure c-puts libc 'puts 'int '(pointer))
-(c-puts "Hello from C!")
+(c-puts (string->c-utf8 "Hello from C!"))