diff --git a/lib/dns/dst_internal.h b/lib/dns/dst_internal.h
index 640519a..fc40472 100644
--- a/lib/dns/dst_internal.h
+++ b/lib/dns/dst_internal.h
@@ -59,6 +59,9 @@
 #include <openssl/objects.h>
 #include <openssl/rsa.h>
 #endif
+#if PKCS11CRYPTO
+#include <pk11/pk11.h>
+#endif
 
 ISC_LANG_BEGINDECLS
 
diff --git a/lib/isc/include/pk11/internal.h b/lib/isc/include/pk11/internal.h
index aa8907a..603712a 100644
--- a/lib/isc/include/pk11/internal.h
+++ b/lib/isc/include/pk11/internal.h
@@ -13,6 +13,8 @@
 #ifndef PK11_INTERNAL_H
 #define PK11_INTERNAL_H 1
 
+#include <pk11/pk11.h>
+
 /*! \file pk11/internal.h */
 
 ISC_LANG_BEGINDECLS