diff --git a/src/main/java/org/olat/modules/fo/restapi/ForumWebService.java b/src/main/java/org/olat/modules/fo/restapi/ForumWebService.java
index 627035b2c5ce356fb2795cda30703e65ae0e067a..890a91fe1114f378eaa1d03b30c38fe3259fbc00 100644
--- a/src/main/java/org/olat/modules/fo/restapi/ForumWebService.java
+++ b/src/main/java/org/olat/modules/fo/restapi/ForumWebService.java
@@ -28,6 +28,7 @@ import java.io.File;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
+import java.net.URI;
 import java.util.ArrayList;
 import java.util.Date;
 import java.util.List;
@@ -51,6 +52,7 @@ import javax.ws.rs.core.Request;
 import javax.ws.rs.core.Response;
 import javax.ws.rs.core.Response.Status;
 import javax.ws.rs.core.StreamingOutput;
+import javax.ws.rs.core.UriBuilder;
 import javax.ws.rs.core.UriInfo;
 
 import org.apache.commons.codec.binary.Base64;
@@ -579,7 +581,12 @@ public class ForumWebService {
 		VFSContainer container = fom.getMessageContainer(mess.getForum().getKey(), mess.getKey());
 		List<FileVO> attachments = new ArrayList<FileVO>();
 		for(VFSItem item: container.getItems(new SystemItemFilter())) {
-			String uri = uriInfo.getAbsolutePathBuilder().path(format(item.getName())).build().toString();
+			UriBuilder attachmentUri = uriInfo.getBaseUriBuilder().path("repo")
+					.path("forums").path(mess.getForum().getKey().toString())
+					.path("posts").path(mess.getKey().toString())
+					.path("attachments").path(format(item.getName()));
+
+			String uri = attachmentUri.build().toString();
 			if(item instanceof VFSLeaf) {
 				attachments.add(new FileVO("self", uri, item.getName(), ((VFSLeaf)item).getSize()));
 			} else {
diff --git a/src/test/java/org/olat/restapi/ForumTest.java b/src/test/java/org/olat/restapi/ForumTest.java
index e307c64a308f61d1b31657207a5558315f4ca235..3d08ee19f8df0ab1901266e21ac596a77fa8c40f 100644
--- a/src/test/java/org/olat/restapi/ForumTest.java
+++ b/src/test/java/org/olat/restapi/ForumTest.java
@@ -393,6 +393,17 @@ public class ForumTest extends OlatJerseyTestCase {
 		assertNotNull(message.getAttachments());
 		assertEquals(2, message.getAttachments().length);
 		
+		for(FileVO attachment:message.getAttachments()) {
+			String title = attachment.getTitle();
+			assertNotNull(title);
+			String href = attachment.getHref();
+			URI attachmentUri = new URI(href);
+			GetMethod getAttachment = createGet(attachmentUri, "*/*", true);
+			int attachmentCode = c.executeMethod(getAttachment);
+			assertEquals(200, attachmentCode);
+		}
+		
+		
 		//check if the file exists
 		ForumManager fm = ForumManager.getInstance();
 		VFSContainer container = fm.getMessageContainer(message.getForumKey(), message.getKey());