diff --git a/src/clj/com/rpl/specter.cljx b/src/clj/com/rpl/specter.cljx
index cc0152a..8a3499e 100644
--- a/src/clj/com/rpl/specter.cljx
+++ b/src/clj/com/rpl/specter.cljx
@@ -284,7 +284,8 @@
   must
   [k]
   (select* [this structure next-fn]
-    (next-fn (get structure k)))
+    (if (contains? structure k)
+      (next-fn (get structure k))))
   (transform* [this structure next-fn]
    (if (contains? structure k)
      (assoc structure k (next-fn (get structure k)))
diff --git a/test/com/rpl/specter/core_test.cljx b/test/com/rpl/specter/core_test.cljx
index 74dfe2a..c9bf24e 100644
--- a/test/com/rpl/specter/core_test.cljx
+++ b/test/com/rpl/specter/core_test.cljx
@@ -255,6 +255,8 @@
       (and (= (s/transform (s/must k1) op m)
               (s/transform (s/keypath k1) op m))
            (= (s/transform (s/must k2) op m) m)
+           (= (s/select (s/must k1) m) (s/select (s/keypath k1) m))
+           (empty? (s/select (s/must k2) m))
            ))))
 
 (defspec parser-test