diff --git a/main/src/data_test/runner.clj b/main/src/data_test/runner.clj
index 4ebe689..dca73ae 100644
--- a/main/src/data_test/runner.clj
+++ b/main/src/data_test/runner.clj
@@ -59,7 +59,7 @@
 
 (s/defn load-test-data
   [file-prefix :- s/Str]
-  (let [file-path (str (data-file-prefix file-prefix) ".edn")]
+  (let [file-path (str file-prefix ".edn")]
     (println file-path)
     (read-data
      (io/resource file-path))))
diff --git a/test/src/data_test/runner_test.clj b/test/src/data_test/runner_test.clj
index c395d9d..e7ac182 100644
--- a/test/src/data_test/runner_test.clj
+++ b/test/src/data_test/runner_test.clj
@@ -33,7 +33,7 @@
 
 (deftest should-load-data
   (is (= {:test "data"}
-         (sut/load-test-data ::test-it))))
+         (sut/load-test-data (sut/data-file-prefix ::test-it)))))
 
 (s/defmethod sut/data-test ::test-it
   [_ input :- s/Any expectation :- s/Any]