diff --git a/src/lib/htable.c b/src/lib/htable.c
index 70c6cf6cba5..61e843d0444 100644
--- a/src/lib/htable.c
+++ b/src/lib/htable.c
@@ -40,6 +40,12 @@
  * Kern Sibbald, July MMIII
  */
 
+#include "hostconfig.h"
+
+#ifdef HAVE_HPUX_OS
+#pragma pack(4)
+#endif
+
 #include "bareos.h"
 
 #define B_PAGE_SIZE 4096