diff --git a/.gitmodules b/.gitmodules
index 15b0a6a16f2..1d66a69279b 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -21,7 +21,7 @@
 [submodule "external/mono"]
     path = external/mono
     url = https://github.com/mono/mono.git
-    branch = 2017-06
+    branch = dev15-5-2017-06
 [submodule "external/mxe"]
     path = external/mxe
     url = https://github.com/xamarin/mxe.git
diff --git a/external/mono b/external/mono
index 7d788778005..fbc487ff424 160000
--- a/external/mono
+++ b/external/mono
@@ -1 +1 @@
-Subproject commit 7d7887780057e40f3921ceedca6c1579a928655d
+Subproject commit fbc487ff424c479c25d0bbd24110d34890ffd793