diff --git a/vanity.hpp b/vanity.hpp
index a5cedda..525e325 100644
--- a/vanity.hpp
+++ b/vanity.hpp
@@ -10,6 +10,7 @@
 #include <unistd.h>
 #include <vector>
 #include <mutex>
+typedef unsigned int __attribute__((__mode__(SI))) ui4b_t; //32 / 8 = 4 byte
 
 static std::mutex thread_mutex;
 static i2p::data::SigningKeyType type;
diff --git a/vanitygen.cpp b/vanitygen.cpp
index adb61e4..5993221 100644
--- a/vanitygen.cpp
+++ b/vanitygen.cpp
@@ -68,7 +68,7 @@ Orignal is sensei of crypto ;)
 */
 	std::cout << "Thread " << id_thread << " binded" << std::endl;
 
-	uint8_t b[391];
+	ui4b_t b[391];
 	memcpy (b, buf, 391);
 
 	int len = strlen (prefix);