diff --git a/library/aria.c b/library/aria.c
index fbdc0ec..498a132 100644
--- a/library/aria.c
+++ b/library/aria.c
@@ -493,6 +493,9 @@
     }
     aria_rot128( ctx->rk[16], w[0], w[1], 19 );
 
+    /* w holds enough info to reconstruct the round keys */
+    mbedtls_zeroize( w, sizeof( w ) );
+
     return( 0 );
 }