diff --git a/include/mshtml.idl b/include/mshtml.idl
index 35bf10d74a2..b25c5e42c72 100644
--- a/include/mshtml.idl
+++ b/include/mshtml.idl
@@ -22,6 +22,7 @@
 
 import "ocidl.idl";
 import "dimm.idl";
+import "shtypes.idl";
 
 cpp_quote("#include <olectl.h>")