diff --git a/alignment/alignment.c b/alignment/alignment.c
new file mode 100644
index 0000000..72a063c
--- /dev/null
+++ b/alignment/alignment.c
@@ -0,0 +1,10 @@
+#include "alignment.h"
+
+size_t align(size_t size)
+{
+    size_t res;
+    if (__builtin_add_overflow(size, 8 - (size % 8), &res))
+        return 0;
+
+    return res;
+}
diff --git a/alignment/alignment.h b/alignment/alignment.h
new file mode 100644
index 0000000..582ce8d
--- /dev/null
+++ b/alignment/alignment.h
@@ -0,0 +1,10 @@
+#ifndef ALIGNMENT_H
+#define ALIGNMENT_H
+
+#define _GNU_SOURCE
+
+#include <stddef.h>
+
+size_t align(size_t size);
+
+#endif /* !ALIGNMENT_H */