diff --git a/packages/vite/src/node/plugins/importAnalysis.ts b/packages/vite/src/node/plugins/importAnalysis.ts
index 48eacf08c2b500..87f6f31c33e9ca 100644
--- a/packages/vite/src/node/plugins/importAnalysis.ts
+++ b/packages/vite/src/node/plugins/importAnalysis.ts
@@ -232,10 +232,11 @@ export function importAnalysisPlugin(config: ResolvedConfig): Plugin {
             e.pos = pos
             throw e
           }
+
+          // prepend base (dev base is guaranteed to have ending slash)
+          url = base + url.replace(/^\//, '')
         }
 
-        // prepend base (dev base is guaranteed to have ending slash)
-        url = base + url.replace(/^\//, '')
         return [url, resolved.id]
       }