diff --git a/src/gsm/milenage/aes_i.h b/src/gsm/milenage/aes_i.h
index c831757..5d89abc 100644
--- a/src/gsm/milenage/aes_i.h
+++ b/src/gsm/milenage/aes_i.h
@@ -66,7 +66,7 @@ extern const u8 rcons[10];
 
 #else /* AES_SMALL_TABLES */
 
-#define RCON(i) (rcons[(i)] << 24)
+#define RCON(i) ((u32)rcons[(i)] << 24)
 
 static inline u32 rotr(u32 val, int bits)
 {