diff --git a/packages/bun-types/bun.d.ts b/packages/bun-types/bun.d.ts
index bfe9476bef6aff..8984367863f389 100644
--- a/packages/bun-types/bun.d.ts
+++ b/packages/bun-types/bun.d.ts
@@ -1350,7 +1350,7 @@ declare module "bun" {
      *       sessionToken: tempSessionToken
      *     });
      */
-    sessionToken?: string;
+    sessionToken?: string | null;
 
     /**
      * The S3-compatible service endpoint URL.
diff --git a/src/s3/credentials.zig b/src/s3/credentials.zig
index a8701f335354b6..bcd3d9878dcac1 100644
--- a/src/s3/credentials.zig
+++ b/src/s3/credentials.zig
@@ -161,6 +161,10 @@ pub const S3Credentials = struct {
                         } else {
                             return globalObject.throwInvalidArgumentTypeValue("bucket", "string", js_value);
                         }
+                    } else if (js_value.isNull()) {
+                        new_credentials.credentials.sessionToken = "";
+                        new_credentials._sessionTokenSlice = null;
+                        new_credentials.changed_credentials = true;
                     }
                 }