diff --git a/app/models/concerns/second_factor_manager.rb b/app/models/concerns/second_factor_manager.rb
index 3db84af886f..8d2429026eb 100644
--- a/app/models/concerns/second_factor_manager.rb
+++ b/app/models/concerns/second_factor_manager.rb
@@ -20,7 +20,7 @@ module SecondFactorManager
 
   def get_totp_object(data)
     require_rotp
-    ROTP::TOTP.new(data, issuer: SiteSetting.title)
+    ROTP::TOTP.new(data, issuer: SiteSetting.title.gsub(":", ""))
   end
 
   def totp_provisioning_uri(data)
diff --git a/spec/components/concern/second_factor_manager_spec.rb b/spec/components/concern/second_factor_manager_spec.rb
index 36e4f066ce8..5a049e2c41b 100644
--- a/spec/components/concern/second_factor_manager_spec.rb
+++ b/spec/components/concern/second_factor_manager_spec.rb
@@ -47,6 +47,18 @@ RSpec.describe SecondFactorManager do
         "otpauth://totp/#{SiteSetting.title}:#{user.email}?secret=#{user_second_factor_totp.data}&issuer=#{SiteSetting.title}"
       )
     end
+    it 'should handle a colon in the site title' do
+      SiteSetting.title = 'Spaceballs: The Discourse'
+      expect(user.user_second_factors.totps.first.totp_provisioning_uri).to eq(
+        "otpauth://totp/Spaceballs%20The%20Discourse:#{user.email}?secret=#{user_second_factor_totp.data}&issuer=Spaceballs+The+Discourse"
+      )
+    end
+    it 'should handle a two words before a colon in the title' do
+      SiteSetting.title = 'Our Spaceballs: The Discourse'
+      expect(user.user_second_factors.totps.first.totp_provisioning_uri).to eq(
+        "otpauth://totp/Our%20Spaceballs%20The%20Discourse:#{user.email}?secret=#{user_second_factor_totp.data}&issuer=Our+Spaceballs+The+Discourse"
+      )
+    end
   end
 
   describe '#authenticate_totp' do