diff --git a/src/utils.ts b/src/utils.ts
index 64fa6f39..83abc902 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -3,11 +3,18 @@ export function slash(str: string) {
 }
 
 export function resolveBasePath(base: string) {
-  if (isAbsolute(base))
-    return base
-  return (!base.startsWith('/') && !base.startsWith('./'))
-    ? `/${base}`
-    : base
+  let basePath = base
+
+  if (!basePath.endsWith('/'))
+    basePath = `${basePath}/`
+
+  if (isAbsolute(basePath))
+    return basePath
+
+  if (!basePath.startsWith('/') && !basePath.startsWith('./'))
+    basePath = `/${basePath}`
+
+  return basePath
 }
 
 export function isAbsolute(url: string) {