diff --git a/dlls/mountmgr.sys/dbus.c b/dlls/mountmgr.sys/dbus.c
index 81c9f89d246..051f735b219 100644
--- a/dlls/mountmgr.sys/dbus.c
+++ b/dlls/mountmgr.sys/dbus.c
@@ -777,8 +777,9 @@ NTSTATUS dhcp_request( void *args )
     ULONG ret = 0;
 
     params->req->offset = params->req->size = 0;
+    *params->ret_size = 0;
 
-    if (!(reply = dhcp4_config_option_request( params->unix_name, map_option(params->req->id), &value ))) return 0;
+    if (!(reply = dhcp4_config_option_request( params->unix_name, map_option(params->req->id), &value ))) return STATUS_SUCCESS;
 
     switch (params->req->id)
     {
diff --git a/dlls/mountmgr.sys/diskarb.c b/dlls/mountmgr.sys/diskarb.c
index 462ff82c691..4bcd72c8916 100644
--- a/dlls/mountmgr.sys/diskarb.c
+++ b/dlls/mountmgr.sys/diskarb.c
@@ -293,18 +293,19 @@ NTSTATUS dhcp_request( void *args )
 
     params->req->offset = 0;
     params->req->size   = 0;
+    *params->ret_size = 0;
 
     if (!service_id) return 0;
     if (!(dict = SCDynamicStoreCopyDHCPInfo( NULL, service_id )))
     {
         CFRelease( service_id );
-        return 0;
+        return STATUS_SUCCESS;
     }
     CFRelease( service_id );
     if (!(value = DHCPInfoGetOptionData( dict, map_option(params->req->id) )))
     {
         CFRelease( dict );
-        return 0;
+        return STATUS_SUCCESS;
     }
     len = CFDataGetLength( value );