diff --git a/test-suite/tests/srfi-1.test b/test-suite/tests/srfi-1.test
index ddaab2f8b..1df83655d 100644
--- a/test-suite/tests/srfi-1.test
+++ b/test-suite/tests/srfi-1.test
@@ -1608,7 +1608,7 @@
 ;; lset-difference!
 ;;
 
-(with-test-prefix "lset-difference"
+(with-test-prefix "lset-difference!"
 
   (pass-if "called arg order"
     (let ((good #f))