diff --git a/library/aesni.c b/library/aesni.c
index 74bae91f5e..3bfc8d0578 100644
--- a/library/aesni.c
+++ b/library/aesni.c
@@ -460,7 +460,7 @@ int mbedtls_aesni_crypt_ecb(mbedtls_aes_context *ctx,
          "movdqu    %%xmm0, (%4)    \n\t" // export output
          :
          : "r" (ctx->nr), "r" (ctx->rk), "r" (mode), "r" (input), "r" (output)
-         : "memory", "cc", "xmm0", "xmm1");
+         : "memory", "cc", "xmm0", "xmm1", "0", "1");
 
 
     return 0;