include: Add missing type to union.
diff --git a/include/cryptuiapi.h b/include/cryptuiapi.h
index 510c7d1..4ba04a3 100644
--- a/include/cryptuiapi.h
+++ b/include/cryptuiapi.h
@@ -271,6 +271,7 @@
         PCCERT_CONTEXT pCertContext;
         PCCTL_CONTEXT  pCTLContext;
         PCCRL_CONTEXT  pCRLContext;
+        HCERTSTORE     hCertStore;
     } DUMMYUNIONNAME;
     DWORD       cStores;
     HCERTSTORE *rghStores;