diff --git a/src/chm_http.c b/src/chm_http.c
index 237e85a..1df2adb 100644
--- a/src/chm_http.c
+++ b/src/chm_http.c
@@ -43,6 +43,8 @@
 #include <sys/socket.h>
 #include <sys/types.h>
 #include <netinet/in.h>
+#include <arpa/inet.h>
+#include <unistd.h>
 
 /* threading includes */
 #include <pthread.h>
diff --git a/src/chm_lib.c b/src/chm_lib.c
index ffd213c..9eb9d1b 100644
--- a/src/chm_lib.c
+++ b/src/chm_lib.c
@@ -48,6 +48,8 @@
  *                                                                         *
  ***************************************************************************/
 
+#define _LARGEFILE64_SOURCE /* for pread64 */
+
 #include "chm_lib.h"
 
 #ifdef CHM_MT