diff --git a/src/hb-aat-layout-common-private.hh b/src/hb-aat-layout-common-private.hh
index 47efb4910..1c6a4af6e 100644
--- a/src/hb-aat-layout-common-private.hh
+++ b/src/hb-aat-layout-common-private.hh
@@ -33,6 +33,9 @@
 namespace AAT {
 
 using namespace OT;
+using OT::UINT8;
+using OT::UINT16;
+using OT::UINT32;
 
 
 /*
diff --git a/src/hb-aat-layout-morx-table.hh b/src/hb-aat-layout-morx-table.hh
index c59616e3a..db4a498cf 100644
--- a/src/hb-aat-layout-morx-table.hh
+++ b/src/hb-aat-layout-morx-table.hh
@@ -37,6 +37,9 @@
 namespace AAT {
 
 using namespace OT;
+using OT::UINT8;
+using OT::UINT16;
+using OT::UINT32;
 
 
 struct RearrangementSubtable