diff --git a/Library/Homebrew/installed_dependents.rb b/Library/Homebrew/installed_dependents.rb
index 7d231943e7..251707fc34 100644
--- a/Library/Homebrew/installed_dependents.rb
+++ b/Library/Homebrew/installed_dependents.rb
@@ -51,7 +51,9 @@ module InstalledDependents
         dependent.missing_dependencies(hide: keg_names)
       when Cask::Cask
         # When checking for cask dependents, we don't care about missing dependencies
-        CaskDependent.new(dependent).runtime_dependencies(ignore_missing: true).map(&:to_formula)
+        CaskDependent.new(dependent).runtime_dependencies(ignore_missing: true).reject do |dependency|
+          dependency.tags.include?(:build)
+        end.map(&:to_formula)
       end
 
       required_kegs = required.map do |f|