diff --git a/ndn-cpp/c/publisher-public-key-digest.h b/ndn-cpp/c/publisher-public-key-digest.h
index 0fcf032..3e02b9b 100644
--- a/ndn-cpp/c/publisher-public-key-digest.h
+++ b/ndn-cpp/c/publisher-public-key-digest.h
@@ -7,6 +7,8 @@
 #ifndef NDN_PUBLISHERPUBLICKEYDIGEST_H
 #define NDN_PUBLISHERPUBLICKEYDIGEST_H
 
+#include "common.h"
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -16,7 +18,7 @@
  * We make a separate struct since this is used by multiple other structs.
  */
 struct ndn_PublisherPublicKeyDigest {
-  unsigned char *publisherPublicKeyDigest;      /**< pointer to pre-allocated buffer.  0 for none */
+  uint8_t *publisherPublicKeyDigest;      /**< pointer to pre-allocated buffer.  0 for none */
   unsigned int publisherPublicKeyDigestLength;  /**< length of publisherPublicKeyDigest.  0 for none */  
 };