diff --git a/lib/datasource/cargo/index.js b/lib/datasource/cargo/index.js
index 20ad10cb88bd0635585e51a6781d52a9da4271c1..47a74f1fb5866ff61a218df24986256868523728 100644
--- a/lib/datasource/cargo/index.js
+++ b/lib/datasource/cargo/index.js
@@ -9,7 +9,7 @@ async function getPkgReleases({ lookupName }) {
     return null;
   }
 
-  const cacheNamespace = 'cargo';
+  const cacheNamespace = 'datasource-cargo';
   const cacheKey = lookupName;
   const cachedResult = await renovateCache.get(cacheNamespace, cacheKey);
   // istanbul ignore if