diff --git a/include/polarssl/padlock.h b/include/polarssl/padlock.h
index cde76ae..cccc55d 100644
--- a/include/polarssl/padlock.h
+++ b/include/polarssl/padlock.h
@@ -38,6 +38,8 @@
 
 #define PADLOCK_ALIGN16(x) (unsigned long *) (16 + ((long) x & ~15))
 
+#define POLARSSL_ERR_PADLOCK_DATA_MISALIGNED                    -0x08E0
+
 #ifdef __cplusplus
 extern "C" {
 #endif