diff --git a/test/functional/issues_controller_test.rb b/test/functional/issues_controller_test.rb
index 88d70a53a..483c92e44 100644
--- a/test/functional/issues_controller_test.rb
+++ b/test/functional/issues_controller_test.rb
@@ -2352,7 +2352,7 @@ class IssuesControllerTest < Redmine::ControllerTest
     assert_select 'div.attachments a.icon-attachment[href=?]', '/attachments/4'
     assert_select 'div.attachments span.attachment-journal a', 1
     assert_select 'div.attachments span.attachment-journal a[href=?][title=?]', '#note-1', '#note-1' do
-      assert_select "svg.icon-svg use:match('href', ?)", /assets\/icons-\w+.svg#icon--chevrons-down/
+      assert_select "svg.icon-svg use:match('href', ?)", %r{assets/icons-[0-9a-f]+.svg#icon--chevrons-down}
     end
   end
 
@@ -2379,10 +2379,10 @@ class IssuesControllerTest < Redmine::ControllerTest
     assert_response :success
     assert_select 'div.attachments' do
       assert_select 'a.icon-attachment[href=?]', '/attachments/1' do
-        assert_select "svg.icon-svg use:match('href', ?)", /assets\/icons-\w+.svg#icon--text-plain/
+        assert_select "svg.icon-svg use:match('href', ?)", %r{assets/icons-[0-9a-f]+.svg#icon--text-plain}
       end
       assert_select 'a.icon-attachment[href=?]', '/attachments/6' do
-        assert_select "svg.icon-svg use:match('href', ?)", /assets\/icons-\w+.svg#icon--application-zip/
+        assert_select "svg.icon-svg use:match('href', ?)", %r{assets/icons-[0-9a-f]+.svg#icon--application-zip}
       end
     end
   end
@@ -6462,7 +6462,7 @@ class IssuesControllerTest < Redmine::ControllerTest
     assert_response :success
     reason = l(:notice_issue_not_closable_by_blocking_issue)
     assert_select 'span.icon-warning[title=?]', reason do
-      assert_select "svg.icon-svg use:match('href', ?)", /assets\/icons-\w+.svg#icon--warning/
+      assert_select "svg.icon-svg use:match('href', ?)", %r{assets/icons-[0-9a-f]+.svg#icon--warning}
       assert_select 'span.icon-label', test: reason
     end
   end
diff --git a/test/integration/layout_test.rb b/test/integration/layout_test.rb
index 7c8a5e2dc..b317b0d23 100644
--- a/test/integration/layout_test.rb
+++ b/test/integration/layout_test.rb
@@ -58,7 +58,7 @@ class LayoutTest < Redmine::IntegrationTest
 
     get '/projects/ecookbook/issues/new'
     assert_select "head script:match('src',?)", %r{/assets/jstoolbar/}, 0
-    assert_select "head link[rel=stylesheet]:match('href',?)", %r{/assets/jstoolbar-\w+.css}
+    assert_select "head link[rel=stylesheet]:match('href',?)", %r{/assets/jstoolbar-[0-9a-f]+.css}
     assert_include "var wikiImageMimeTypes = #{Redmine::MimeType.by_type('image').to_json};", response.body
     assert_select 'div.jstBlock:has(textarea#issue_description)' do
       UserPreference::DEFAULT_TOOLBAR_LANGUAGE_OPTIONS.each do |lang|
diff --git a/test/integration/lib/redmine/themes_test.rb b/test/integration/lib/redmine/themes_test.rb
index 7fe7d3192..9f75f786e 100644
--- a/test/integration/lib/redmine/themes_test.rb
+++ b/test/integration/lib/redmine/themes_test.rb
@@ -34,7 +34,7 @@ class ThemesTest < Redmine::IntegrationTest
     get '/'
 
     assert_response :success
-    assert_select "link[rel=stylesheet]:match('href', ?)", %r{/assets/themes/#{@theme.dir}/application-\w+\.css}
+    assert_select "link[rel=stylesheet]:match('href', ?)", %r{/assets/themes/#{@theme.dir}/application-[0-9a-f]+.css}
   end
 
   def test_without_theme_js
@@ -62,7 +62,7 @@ class ThemesTest < Redmine::IntegrationTest
     get '/'
 
     assert_response :success
-    assert_select "link[rel='shortcut icon']:match('href',?)", %r{/assets/favicon-\w+\.ico}
+    assert_select "link[rel='shortcut icon']:match('href',?)", %r{/assets/favicon-[0-9a-f]+.ico}
   end
 
   def test_use_theme_favicon_if_theme_provides_one
@@ -108,7 +108,7 @@ class ThemesTest < Redmine::IntegrationTest
     get '/'
 
     assert_response :success
-    assert_select "link[rel=stylesheet]:match('href', ?)", %r{/foo/assets/themes/#{@theme.dir}/application-\w+\.css}
+    assert_select "link[rel=stylesheet]:match('href', ?)", %r{/foo/assets/themes/#{@theme.dir}/application-[0-9a-f]+.css}
     assert_select "script[src^=?]", "/foo/assets/themes/#{@theme.dir}/theme.js"
     assert_select 'link[rel="shortcut icon"][href^=?]', "/foo/assets/themes/#{@theme.dir}/a.ico"
   ensure