diff --git a/src/crypto/md5-internal.c b/src/crypto/md5-internal.c
index 790a6f368..f0a2a5d3a 100644
--- a/src/crypto/md5-internal.c
+++ b/src/crypto/md5-internal.c
@@ -176,8 +176,8 @@ void MD5Final(unsigned char digest[16], struct MD5Context *ctx)
     byteReverse(ctx->in, 14);
 
     /* Append length in bits and transform */
-    ((u32 *) ctx->in)[14] = ctx->bits[0];
-    ((u32 *) ctx->in)[15] = ctx->bits[1];
+    ((u32 *) aliasing_hide_typecast(ctx->in, u32))[14] = ctx->bits[0];
+    ((u32 *) aliasing_hide_typecast(ctx->in, u32))[15] = ctx->bits[1];
 
     MD5Transform(ctx->buf, (u32 *) ctx->in);
     byteReverse((unsigned char *) ctx->buf, 4);