diff --git a/pkg/libb2/include/config.h b/pkg/libb2/include/config.h
index 55cc6a0e8e..75e6d3aeb4 100644
--- a/pkg/libb2/include/config.h
+++ b/pkg/libb2/include/config.h
@@ -1,6 +1,8 @@
 #ifndef CONFIG_H
 #define CONFIG_H
 
+#include "cpu.h"
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -13,6 +15,10 @@ extern "C" {
 #define NATIVE_LITTLE_ENDIAN
 #endif
 
+#ifndef CPU_HAS_UNALIGNED_ACCESS
+#define HAVE_ALIGNED_ACCESS_REQUIRED
+#endif
+
 #ifdef __cplusplus
 }
 #endif