diff --git a/packages/lib/createTestMountParameters/CHANGELOG.md b/packages/lib/createTestMountParameters/CHANGELOG.md
index 8ce0524ad..823fa38b3 100644
--- a/packages/lib/createTestMountParameters/CHANGELOG.md
+++ b/packages/lib/createTestMountParameters/CHANGELOG.md
@@ -1,5 +1,9 @@
 # CHANGELOG
 
+## unpublished
+
+- Fix: Test now uses a mock EPSG code instead of an empty string.
+
 ## 1.2.0
 
 - Feature: Extend mock state to match current core state type.
diff --git a/packages/lib/createTestMountParameters/index.ts b/packages/lib/createTestMountParameters/index.ts
index f7153532b..aa42e8b61 100644
--- a/packages/lib/createTestMountParameters/index.ts
+++ b/packages/lib/createTestMountParameters/index.ts
@@ -49,7 +49,7 @@ export default (): MockParameters => {
       center: null,
       components: 1,
       configuration: {
-        epsg: '',
+        epsg: 'EPSG:12345',
         layerConf: [],
         namedProjections: [],
         layers: [],