diff --git a/core/src/lib/htable.cc b/core/src/lib/htable.cc
index 1f76acc59ce..7cff8978619 100644
--- a/core/src/lib/htable.cc
+++ b/core/src/lib/htable.cc
@@ -40,6 +40,7 @@
  * Kern Sibbald, July MMIII
  */
 
+#include <cinttypes>
 #include "include/hostconfig.h"
 
 #ifdef HAVE_HPUX_OS
@@ -256,7 +257,7 @@ void htable::stats()
   printf("buckets=%d num_items=%d max_items=%d\n", buckets, num_items,
          max_items);
   printf("max hits in a bucket = %d\n", max);
-  printf("total bytes malloced = %lu\n", total_size);
+  printf("total bytes malloced = %" PRIu64 "\n", total_size);
   printf("total blocks malloced = %d\n", blocks);
 }