diff --git a/library/chachapoly.c b/library/chachapoly.c
index 80c1ebf..860f877 100644
--- a/library/chachapoly.c
+++ b/library/chachapoly.c
@@ -187,7 +187,7 @@
     }
     else if( ctx->state != CHACHAPOLY_STATE_AAD )
     {
-        return(MBEDTLS_ERR_CHACHAPOLY_BAD_STATE );
+        return( MBEDTLS_ERR_CHACHAPOLY_BAD_STATE );
     }
 
     ctx->aad_len += aad_len;