diff --git a/Library/Homebrew/tap.rb b/Library/Homebrew/tap.rb
index f66261d14b..ec38eb9292 100644
--- a/Library/Homebrew/tap.rb
+++ b/Library/Homebrew/tap.rb
@@ -134,7 +134,7 @@ class Tap
 
   sig { returns(T::Set[Tap]) }
   def self.allowed_taps
-    cache_key = "allowed_taps_#{Homebrew::EnvConfig.allowed_taps.to_s.gsub(" ", "_")}".to_sym
+    cache_key = :"allowed_taps_#{Homebrew::EnvConfig.allowed_taps.to_s.tr(" ", "_")}"
     cache[cache_key] ||= begin
       allowed_tap_list = Homebrew::EnvConfig.allowed_taps.to_s.split
 
@@ -149,7 +149,7 @@ class Tap
 
   sig { returns(T::Set[Tap]) }
   def self.forbidden_taps
-    cache_key = "forbidden_taps_#{Homebrew::EnvConfig.forbidden_taps.to_s.gsub(" ", "_")}".to_sym
+    cache_key = :"forbidden_taps_#{Homebrew::EnvConfig.forbidden_taps.to_s.tr(" ", "_")}"
     cache[cache_key] ||= begin
       forbidden_tap_list = Homebrew::EnvConfig.forbidden_taps.to_s.split
 
diff --git a/Library/Homebrew/test/cask/installer_spec.rb b/Library/Homebrew/test/cask/installer_spec.rb
index b0e22b9b92..568d848909 100644
--- a/Library/Homebrew/test/cask/installer_spec.rb
+++ b/Library/Homebrew/test/cask/installer_spec.rb
@@ -327,8 +327,7 @@ RSpec.describe Cask::Installer, :cask do
 
   describe "#forbidden_tap_check" do
     before do
-      allow(Tap).to receive(:allowed_taps).and_return(allowed_taps_set)
-      allow(Tap).to receive(:forbidden_taps).and_return(forbidden_taps_set)
+      allow(Tap).to receive_messages(allowed_taps: allowed_taps_set, forbidden_taps: forbidden_taps_set)
     end
 
     let(:homebrew_forbidden) { Tap.fetch("homebrew/forbidden") }
diff --git a/Library/Homebrew/test/formula_installer_spec.rb b/Library/Homebrew/test/formula_installer_spec.rb
index d0878a3e3c..e2655cd0c5 100644
--- a/Library/Homebrew/test/formula_installer_spec.rb
+++ b/Library/Homebrew/test/formula_installer_spec.rb
@@ -259,8 +259,7 @@ RSpec.describe FormulaInstaller do
 
   describe "#forbidden_tap_check" do
     before do
-      allow(Tap).to receive(:allowed_taps).and_return(allowed_taps_set)
-      allow(Tap).to receive(:forbidden_taps).and_return(forbidden_taps_set)
+      allow(Tap).to receive_messages(allowed_taps: allowed_taps_set, forbidden_taps: forbidden_taps_set)
     end
 
     let(:homebrew_forbidden) { Tap.fetch("homebrew/forbidden") }