diff --git a/configure.ac b/configure.ac
index 7405450..e7594c5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -19,6 +19,7 @@ AC_CANONICAL_HOST
 #                                                            Checks for programs
 #-------------------------------------------------------------------------------
 AC_PROG_CC
+AC_C_BIGENDIAN
 #-------------------------------------------------------------------------------
 #                                                        Checks for header files
 #-------------------------------------------------------------------------------
diff --git a/src/sha1.c b/src/sha1.c
index 3826c76..6a5f0e3 100644
--- a/src/sha1.c
+++ b/src/sha1.c
@@ -43,6 +43,7 @@
 #include <stdlib.h>
 #include <string.h>
 
+#include "config.h"
 #include "sha1.h"
 
 #define rol(val, n) (((val) << (n)) | ((val) >> (32 - (n))))