diff --git a/apis/cloudfiles/src/test/java/org/jclouds/cloudfiles/blobstore/CloudFilesBlobSignerExpectTest.java b/apis/cloudfiles/src/test/java/org/jclouds/cloudfiles/blobstore/CloudFilesBlobSignerExpectTest.java
index 8572105a58..1fad64a517 100644
--- a/apis/cloudfiles/src/test/java/org/jclouds/cloudfiles/blobstore/CloudFilesBlobSignerExpectTest.java
+++ b/apis/cloudfiles/src/test/java/org/jclouds/cloudfiles/blobstore/CloudFilesBlobSignerExpectTest.java
@@ -80,12 +80,14 @@ public class CloudFilesBlobSignerExpectTest extends BaseBlobSignerExpectTest {
    protected HttpRequest putBlob() {
       return HttpRequest.builder().method("PUT")
             .endpoint("https://storage101.lon3.clouddrive.com/v1/MossoCloudFS_83a9d536-2e25-4166-bd3b-a503a934f953/container/name")
+            .addHeader("Expect", "100-continue")
             .addHeader("X-Auth-Token", authToken).build();
    }
 
    @Override
    protected HttpRequest putBlobWithTime() {
       return HttpRequest.builder().method("PUT")
+            .addHeader("Expect", "100-continue")
             .endpoint("https://storage101.lon3.clouddrive.com/v1/MossoCloudFS_83a9d536-2e25-4166-bd3b-a503a934f953/container/name?temp_url_sig=f83fa711f353f6f0bab3a66c56e35a972b9b3922&temp_url_expires=123456792").build();
    }
 
diff --git a/apis/swift/src/main/java/org/jclouds/openstack/swift/CommonSwiftAsyncClient.java b/apis/swift/src/main/java/org/jclouds/openstack/swift/CommonSwiftAsyncClient.java
index 0b642ea608..d867afb522 100644
--- a/apis/swift/src/main/java/org/jclouds/openstack/swift/CommonSwiftAsyncClient.java
+++ b/apis/swift/src/main/java/org/jclouds/openstack/swift/CommonSwiftAsyncClient.java
@@ -18,6 +18,8 @@
  */
 package org.jclouds.openstack.swift;
 
+import static com.google.common.net.HttpHeaders.EXPECT;
+
 import java.util.Map;
 import java.util.Set;
 
@@ -196,6 +198,7 @@ public interface CommonSwiftAsyncClient {
    @Named("PutObject")
    @PUT
    @Path("/{container}/{name}")
+   @Headers(keys = EXPECT, values = "100-continue")
    @ResponseParser(ParseETagHeader.class)
    ListenableFuture<String> putObject(@PathParam("container") String container,
                                       @PathParam("name") @ParamParser(ObjectName.class) @BinderParam(BindSwiftObjectMetadataToRequest.class) SwiftObject object);
diff --git a/apis/swift/src/test/java/org/jclouds/openstack/swift/blobstore/SwiftBlobSignerExpectTest.java b/apis/swift/src/test/java/org/jclouds/openstack/swift/blobstore/SwiftBlobSignerExpectTest.java
index 6a92ff5b35..d0c8bd2863 100644
--- a/apis/swift/src/test/java/org/jclouds/openstack/swift/blobstore/SwiftBlobSignerExpectTest.java
+++ b/apis/swift/src/test/java/org/jclouds/openstack/swift/blobstore/SwiftBlobSignerExpectTest.java
@@ -78,6 +78,7 @@ public class SwiftBlobSignerExpectTest extends BaseBlobSignerExpectTest {
    protected HttpRequest putBlob() {
       return HttpRequest.builder().method("PUT")
             .endpoint("http://storage/container/name")
+            .addHeader("Expect", "100-continue")
             .addHeader("X-Auth-Token", "testtoken").build();
    }
 
@@ -85,6 +86,7 @@ public class SwiftBlobSignerExpectTest extends BaseBlobSignerExpectTest {
    protected HttpRequest putBlobWithTime() {
       return HttpRequest.builder().method("PUT")
             .endpoint("http://storage/container/name?temp_url_sig=e894c60fa1284cc575cf22d7786bab07b8c33610&temp_url_expires=123456792")
+            .addHeader("Expect", "100-continue")
             .build();
    }
 
diff --git a/apis/swift/src/test/java/org/jclouds/openstack/swift/blobstore/SwiftKeystoneBlobSignerExpectTest.java b/apis/swift/src/test/java/org/jclouds/openstack/swift/blobstore/SwiftKeystoneBlobSignerExpectTest.java
index 565e6f0d27..59ec1c5a4a 100644
--- a/apis/swift/src/test/java/org/jclouds/openstack/swift/blobstore/SwiftKeystoneBlobSignerExpectTest.java
+++ b/apis/swift/src/test/java/org/jclouds/openstack/swift/blobstore/SwiftKeystoneBlobSignerExpectTest.java
@@ -72,13 +72,16 @@ public class SwiftKeystoneBlobSignerExpectTest extends BaseBlobSignerExpectTest
    protected HttpRequest putBlob() {
       return HttpRequest.builder().method("PUT")
             .endpoint("https://objects.jclouds.org/v1.0/40806637803162/container/name")
+            .addHeader("Expect", "100-continue")
             .addHeader("X-Auth-Token", "Auth_4f173437e4b013bee56d1007").build();
    }
 
    @Override
    protected HttpRequest putBlobWithTime() {
       return HttpRequest.builder().method("PUT")
-            .endpoint("https://objects.jclouds.org/v1.0/40806637803162/container/name?temp_url_sig=72e5f6ebafab2b3da0586198797e58fb7478211e&temp_url_expires=123456792").build();
+            .endpoint("https://objects.jclouds.org/v1.0/40806637803162/container/name?temp_url_sig=72e5f6ebafab2b3da0586198797e58fb7478211e&temp_url_expires=123456792")
+            .addHeader("Expect", "100-continue")
+            .build();
    }
 
    @Override
diff --git a/providers/hpcloud-objectstorage/src/test/java/org/jclouds/hpcloud/objectstorage/blobstore/HPCloudObjectStorageBlobSignerExpectTest.java b/providers/hpcloud-objectstorage/src/test/java/org/jclouds/hpcloud/objectstorage/blobstore/HPCloudObjectStorageBlobSignerExpectTest.java
index 51bf2a44be..7dc156b82b 100644
--- a/providers/hpcloud-objectstorage/src/test/java/org/jclouds/hpcloud/objectstorage/blobstore/HPCloudObjectStorageBlobSignerExpectTest.java
+++ b/providers/hpcloud-objectstorage/src/test/java/org/jclouds/hpcloud/objectstorage/blobstore/HPCloudObjectStorageBlobSignerExpectTest.java
@@ -75,6 +75,7 @@ public class HPCloudObjectStorageBlobSignerExpectTest extends BaseBlobSignerExpe
    protected HttpRequest putBlob() {
       return HttpRequest.builder().method("PUT")
             .endpoint("https://objects.jclouds.org/v1.0/40806637803162/container/name")
+            .addHeader("Expect", "100-continue")
             .addHeader("X-Auth-Token", "Auth_4f173437e4b013bee56d1007").build();
    }
 
@@ -82,6 +83,7 @@ public class HPCloudObjectStorageBlobSignerExpectTest extends BaseBlobSignerExpe
    protected HttpRequest putBlobWithTime() {
       return HttpRequest.builder().method("PUT")
             .endpoint("https://objects.jclouds.org/v1.0/40806637803162/container/name?temp_url_sig=40806637803162%3Aidentity%3Ac90269245ab0a316d5ea5e654d4c2a975fb4bf77&temp_url_expires=123456792")
+            .addHeader("Expect", "100-continue")
             .build();
    }