diff --git a/lib/versioning/docker/index.js b/lib/versioning/docker/index.js
index ba6830e1efebdb6d3eefef9a3ac24c18f79aff9e..92a0592e7f080ada864187c1768a711c9e3b36da 100644
--- a/lib/versioning/docker/index.js
+++ b/lib/versioning/docker/index.js
@@ -10,10 +10,6 @@ function parse(version) {
 function compare(version1, vervion2) {
   const parsed1 = parse(version1);
   const parsed2 = parse(vervion2);
-  // istanbul ignore if
-  if (!(parsed1 && parsed2)) {
-    return 1;
-  }
   const length = Math.max(parsed1.release.length, parsed2.release.length);
   for (let i = 0; i < length; i += 1) {
     const part1 = parsed1.release[i];