diff --git a/runtimes/core/src/objects/mod.rs b/runtimes/core/src/objects/mod.rs
index a537bd6f0b..4aab5601c0 100644
--- a/runtimes/core/src/objects/mod.rs
+++ b/runtimes/core/src/objects/mod.rs
@@ -496,17 +496,13 @@ fn escape_path(s: &str) -> Cow<'_, str> {
 /// Computes the public url given a base url, optional key prefix, and object name.
 fn public_url(base_url: String, key_prefix: Option<&str>, name: &str) -> String {
     let mut url = base_url;
-    if let Some(key_prefix) = key_prefix {
-        if !url.ends_with('/') {
-            url.push('/');
-        }
-        url.push_str(&escape_path(key_prefix));
-    }
 
     if !url.ends_with('/') {
         url.push('/');
     }
-
+    if let Some(key_prefix) = key_prefix {
+        url.push_str(&escape_path(key_prefix));
+    }
     url.push_str(&escape_path(name));
     url
 }
diff --git a/runtimes/go/storage/objects/bucket.go b/runtimes/go/storage/objects/bucket.go
index 6fa44d8196..92ddc98a45 100644
--- a/runtimes/go/storage/objects/bucket.go
+++ b/runtimes/go/storage/objects/bucket.go
@@ -143,6 +143,11 @@ func (b *Bucket) PublicURL(object string, options ...PublicURLOption) *url.URL {
 	if !strings.HasSuffix(u.Path, "/") {
 		u.Path += "/"
 	}
+
+	if b.runtimeCfg.KeyPrefix != "" {
+		u.Path += escape(b.runtimeCfg.KeyPrefix, encodePath)
+	}
+
 	u.Path += escape(object, encodePath)
 
 	return &u