diff --git a/lib/spoom/sorbet/metrics.rb b/lib/spoom/sorbet/metrics.rb
index 00c9f32b..8b3ee9ae 100644
--- a/lib/spoom/sorbet/metrics.rb
+++ b/lib/spoom/sorbet/metrics.rb
@@ -6,7 +6,7 @@
 module Spoom
   module Sorbet
     module MetricsParser
-      DEFAULT_PREFIX = "ruby_typer.unknown.."
+      DEFAULT_PREFIX = "ruby_typer.unknown."
 
       class << self
         extend T::Sig