diff --git a/src/main/cljc/dda/c4k_common/predicate.cljc b/src/main/cljc/dda/c4k_common/predicate.cljc
index 49a3132..b6be693 100644
--- a/src/main/cljc/dda/c4k_common/predicate.cljc
+++ b/src/main/cljc/dda/c4k_common/predicate.cljc
@@ -24,7 +24,7 @@
 
 (defn stage?
   [input]
-  (contains? #{:prod :acc :int :test :dev} input))
+  (contains? #{"prod" "acc" "int" "test" "dev"} input))
 
 (defn map-or-seq?
   [input]
@@ -33,7 +33,7 @@
 
 (defn pvc-storage-class-name?
   [input]
-  (contains? #{:manual :local-path} input))
+  (contains? #{"manual" "local-path"} input))
 
 (defn port-number?
   [input]
diff --git a/src/test/cljc/dda/c4k_common/predicate_test.cljc b/src/test/cljc/dda/c4k_common/predicate_test.cljc
index a492a0e..dc3b420 100644
--- a/src/test/cljc/dda/c4k_common/predicate_test.cljc
+++ b/src/test/cljc/dda/c4k_common/predicate_test.cljc
@@ -34,9 +34,9 @@
   (is (false? (cut/map-or-seq? "1,2,3"))))
 
 (deftest test-pvc-storage-class-name?
-  (is (true? (cut/pvc-storage-class-name? :manual)))
-  (is (true? (cut/pvc-storage-class-name? :local-path)))
-  (is (false? (cut/pvc-storage-class-name? :none))))
+  (is (true? (cut/pvc-storage-class-name? "manual")))
+  (is (true? (cut/pvc-storage-class-name? "local-path")))
+  (is (false? (cut/pvc-storage-class-name? "none"))))
 
 (deftest test-port-number?
   (is (true? (cut/port-number? 1)))