diff --git a/rspamd_exporter.py b/rspamd_exporter.py
index 7f939f3..23221e8 100644
--- a/rspamd_exporter.py
+++ b/rspamd_exporter.py
@@ -20,9 +20,9 @@ def json_to_prom(json, prefix, instance):
             if len(v) != 1:
                 prefix = prefix + "_" + v.index(item)
             if type(item) is bool:
-                outlines += "{}_{}{{instance=\"{}\"}} {}\n".format(prefix, k, instance, 1 if item else 0)
+                outlines += '{}_{}{{instance="{}"}} {}\n'.format(prefix, k, instance, 1 if item else 0)
             if type(item) in [int, str]:
-                outlines += "{}_{}{{instance=\"{}\"}} {}\n".format(prefix, k, instance,item)
+                outlines += '{}_{}{{instance="{}"}} {}\n'.format(prefix, k, instance,item)
             if type(item) is dict:
                 outlines += json_to_prom(item, "{}_{}".format(prefix, k), instance)
     return outlines