diff --git a/lib/hx509/hx509.h b/lib/hx509/hx509.h
index a286bbba4..1d6139a13 100644
--- a/lib/hx509/hx509.h
+++ b/lib/hx509/hx509.h
@@ -84,6 +84,16 @@ typedef struct hx509_octet_string_list {
     heim_octet_string *val;
 } hx509_octet_string_list;
 
+typedef struct hx509_pem_header {
+    struct hx509_pem_header *next;
+    char *header;
+    char *value;
+} hx509_pem_header;
+
+typedef int
+(*hx509_pem_read_func)(hx509_context, const char *, const hx509_pem_header *,
+		       const void *, size_t, void *ctx);
+
 /*
  * Options passed to hx509_query_match_option.
  */