diff --git a/library/md2.c b/library/md2.c
index cbdaaab..fdcb630 100644
--- a/library/md2.c
+++ b/library/md2.c
@@ -177,6 +177,9 @@
         t  = ctx->cksum[i];
     }
 
+    /* Zeroise variables to clear sensitive data from memory. */
+    mbedtls_platform_zeroize( &t, sizeof( t ) );
+
     return( 0 );
 }