diff --git a/test/lisp/calc/calc-tests.el b/test/lisp/calc/calc-tests.el
index d96672c04a1..b64c1682efe 100644
--- a/test/lisp/calc/calc-tests.el
+++ b/test/lisp/calc/calc-tests.el
@@ -861,7 +861,7 @@ An existing calc stack is reused, otherwise a new one is created."
   ;; exponent/subscript
   (should (string= (concat "+/-*:-/*inf<=>=<=>=μ(1:4)(1:2)(3:4)(1:3)(2:3)"
                            "(1:5)(2:5)(3:5)(4:5)(1:6)(5:6)"
-                           "(1:8)(3:8)(5:8)(7:8)1:^(0123456789+-()ni)"
+                           "(1:8)(3:8)(5:8)(7:8)1::^(0123456789+-()ni)"
                            "_(0123456789+-())")
                    (math-read-preprocess-string
                     (mapconcat #'car math-read-replacement-list))))