diff --git a/lib/manager/docker-compose/extract.ts b/lib/manager/docker-compose/extract.ts
index 549f2f922094c79f14c7fd6aa66024bd71d9b538..606859ec49fdc96ab81fb61b7cf323574c0dc6d8 100644
--- a/lib/manager/docker-compose/extract.ts
+++ b/lib/manager/docker-compose/extract.ts
@@ -43,7 +43,7 @@ export function extractPackageFile(
   logger.debug('docker-compose.extractPackageFile()');
   let config: DockerComposeConfig;
   try {
-    config = safeLoad(content);
+    config = safeLoad(content, { json: true });
     // istanbul ignore if
     if (!config) {
       logger.info(