diff --git a/snippets/robots-allow-all.conf b/snippets/robots-allow-all.conf
index bff79a7517bd02812e713ad8c0c2b6eb9c7a2072..627aee5db300861870c3dc70c82016a4abd676c2 100644
--- a/snippets/robots-allow-all.conf
+++ b/snippets/robots-allow-all.conf
@@ -1,4 +1,4 @@
 location = /robots.txt {
-    add_header Content-Type text/plain;
+    add_header Content-Type "text/plain; charset=utf-8";
     return 200 "User-agent: *\nDisallow:\n";
 }
diff --git a/snippets/robots-disallow-all.conf b/snippets/robots-disallow-all.conf
index d5c02655ab880ac7873d74d597025e238c07d822..03d50312dfd4108ef9758ff8d65f4d090d0a4c1c 100644
--- a/snippets/robots-disallow-all.conf
+++ b/snippets/robots-disallow-all.conf
@@ -1,4 +1,4 @@
 location = /robots.txt {
-    add_header Content-Type text/plain;
+    add_header Content-Type "text/plain; charset=utf-8";
     return 200 "User-agent: *\nDisallow: *\n";
 }