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diff --git a/lib/isc/include/pk11/internal.h b/lib/isc/include/pk11/internal.h
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index aa8907a..603712a 100644
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--- a/lib/isc/include/pk11/internal.h
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+++ b/lib/isc/include/pk11/internal.h
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@@ -13,6 +13,8 @@
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 #ifndef PK11_INTERNAL_H
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 #define PK11_INTERNAL_H 1
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+#include <pk11/pk11.h>
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+
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 /*! \file pk11/internal.h */
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 ISC_LANG_BEGINDECLS