diff --git a/CHANGELOG.md b/CHANGELOG.md
index 518adb7..ea86ded 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+### Fixed
+- Fix `Spectator.configure` block calls to `filter_run_excluding` and `filter_run_including`. [#61](https://gitlab.com/arctic-fox/spectator/-/issues/61)
+
 ## [0.10.0] - 2021-09-19
 ### Fixed
 - Fix resolution of types with the same name in nested scopes. [#31](https://github.com/icy-arctic-fox/spectator/issues/31)
diff --git a/src/spectator/config/builder.cr b/src/spectator/config/builder.cr
index 7866fc6..c7bdfa7 100644
--- a/src/spectator/config/builder.cr
+++ b/src/spectator/config/builder.cr
@@ -270,8 +270,8 @@ module Spectator
 
       # Specifies one or more tags to constrain running examples to.
       def filter_run_including(*tags : Symbol, **values)
-        tags.each { |tag| @filters << TagNodeFilter.new(tag) }
-        values.each { |tag, value| @filters << TagNodeFilter.new(tag, value.to_s) }
+        tags.each { |tag| @filters << TagNodeFilter.new(tag.to_s) }
+        values.each { |tag, value| @filters << TagNodeFilter.new(tag.to_s, value.to_s) }
       end
 
       # Adds a filter to prevent examples from running.
@@ -281,8 +281,8 @@ module Spectator
 
       # Specifies one or more tags to exclude from running examples.
       def filter_run_excluding(*tags : Symbol, **values)
-        tags.each { |tag| @rejects << TagNodeFilter.new(tag) }
-        values.each { |tag, value| @rejects << TagNodeFilter.new(tag, value.to_s) }
+        tags.each { |tag| @rejects << TagNodeFilter.new(tag.to_s) }
+        values.each { |tag, value| @rejects << TagNodeFilter.new(tag.to_s, value.to_s) }
       end
 
       # Specifies one or more tags to filter on only if they're present in the spec.