diff --git a/preamble.cabal b/preamble.cabal
--- a/preamble.cabal
+++ b/preamble.cabal
@@ -1,5 +1,5 @@
 name:                  preamble
-version:               0.0.36
+version:               0.0.37
 synopsis:              Yet another prelude.
 description:           A prelude built on basic-prelude.
 homepage:              https://github.com/swift-nav/preamble
diff --git a/src/Preamble/Stats.hs b/src/Preamble/Stats.hs
--- a/src/Preamble/Stats.hs
+++ b/src/Preamble/Stats.hs
@@ -21,7 +21,7 @@
 stats :: (MonadStatsCtx c m, Show a) => Text -> Text -> a -> Tags -> m ()
 stats metric name value tags = do
   labels <- (<> tags) <$> view scLabels
-  prefix <- ap (bool mempty) T.null <$> view scPrefix
+  prefix <- ap (flip bool mempty) T.null <$> view scPrefix
   let statsd = prefix <> name -:- show value -|- metric
       tagged = T.intercalate "," $ flip map labels $ uncurry (-:-)
   stat <- view scStat