diff --git a/packages/backend-defaults/report-rootLogger.api.md b/packages/backend-defaults/report-rootLogger.api.md
index aa27a366e3..99dc263358 100644
--- a/packages/backend-defaults/report-rootLogger.api.md
+++ b/packages/backend-defaults/report-rootLogger.api.md
@@ -6,7 +6,7 @@
 import { config } from 'winston';
 import { Format } from 'logform';
 import { JsonObject } from '@backstage/types';
-import { JsonValue } from '@backstage/types';
+import { JsonPrimitive } from '@backstage/types';
 import { LoggerService } from '@backstage/backend-plugin-api';
 import { RootLoggerService } from '@backstage/backend-plugin-api';
 import { ServiceFactory } from '@backstage/backend-plugin-api';
@@ -55,7 +55,7 @@ export type WinstonLoggerLevelOverride = {
 
 // @public (undocumented)
 export type WinstonLoggerLevelOverrideMatchers = {
-  [key: string]: JsonValue | undefined;
+  [key: string]: JsonPrimitive | JsonPrimitive[] | undefined;
 };
 
 // @public (undocumented)
diff --git a/packages/backend-defaults/src/entrypoints/rootLogger/config.ts b/packages/backend-defaults/src/entrypoints/rootLogger/config.ts
index 24660f82c8..11687d72f4 100644
--- a/packages/backend-defaults/src/entrypoints/rootLogger/config.ts
+++ b/packages/backend-defaults/src/entrypoints/rootLogger/config.ts
@@ -15,7 +15,11 @@
  */
 import { RootConfigService } from '@backstage/backend-plugin-api';
 import { JsonObject } from '@backstage/types';
-import { RootLoggerConfig, winstonLevels } from './types';
+import {
+  RootLoggerConfig,
+  winstonLevels,
+  WinstonLoggerLevelOverrideMatchers,
+} from './types';
 
 export const getRootLoggerConfig = (
   config: RootConfigService,
@@ -36,7 +40,9 @@ export const getRootLoggerConfig = (
       );
     }
 
-    const matchers = override.getConfig('matchers').get<JsonObject>();
+    const matchers = override
+      .getConfig('matchers')
+      .get<WinstonLoggerLevelOverrideMatchers>();
 
     return {
       matchers,
diff --git a/packages/backend-defaults/src/entrypoints/rootLogger/types.ts b/packages/backend-defaults/src/entrypoints/rootLogger/types.ts
index b1f6fcc5b3..f8277d8075 100644
--- a/packages/backend-defaults/src/entrypoints/rootLogger/types.ts
+++ b/packages/backend-defaults/src/entrypoints/rootLogger/types.ts
@@ -13,14 +13,14 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-import { JsonObject, JsonValue } from '@backstage/types';
+import { JsonObject, JsonPrimitive } from '@backstage/types';
 import { config as winstonConfig } from 'winston';
 
 /**
  * @public
  */
 export type WinstonLoggerLevelOverrideMatchers = {
-  [key: string]: JsonValue | undefined;
+  [key: string]: JsonPrimitive | JsonPrimitive[] | undefined;
 };
 
 /**