diff --git a/Library/Homebrew/cli/parser.rb b/Library/Homebrew/cli/parser.rb
index d09f1730ed..4fc804ad65 100644
--- a/Library/Homebrew/cli/parser.rb
+++ b/Library/Homebrew/cli/parser.rb
@@ -148,7 +148,7 @@ module Homebrew
         generate_banner
       end
 
-      def switch(*names, description: nil, replacement: nil, env: nil, required_for: nil, depends_on: nil,
+      def switch(*names, description: nil, replacement: nil, env: nil, depends_on: nil,
                  method: :on, hidden: false)
         global_switch = names.first.is_a?(Symbol)
         return if global_switch
@@ -167,7 +167,7 @@ module Homebrew
         end
 
         names.each do |name|
-          set_constraints(name, required_for: required_for, depends_on: depends_on)
+          set_constraints(name, depends_on: depends_on)
         end
 
         env_value = env?(env)
@@ -204,8 +204,7 @@ module Homebrew
         end
       end
 
-      def flag(*names, description: nil, replacement: nil, required_for: nil,
-               depends_on: nil, hidden: false)
+      def flag(*names, description: nil, replacement: nil, depends_on: nil, hidden: false)
         required, flag_type = if names.any? { |name| name.end_with? "=" }
           [OptionParser::REQUIRED_ARGUMENT, :required_flag]
         else
@@ -226,7 +225,7 @@ module Homebrew
         end
 
         names.each do |name|
-          set_constraints(name, required_for: required_for, depends_on: depends_on)
+          set_constraints(name, depends_on: depends_on)
         end
       end
 
@@ -506,31 +505,25 @@ module Homebrew
         Formatter.format_help_text(desc, width: OPTION_DESC_WIDTH).split("\n")
       end
 
-      def set_constraints(name, depends_on:, required_for:)
-        secondary = option_to_name(name)
-        unless required_for.nil?
-          primary = option_to_name(required_for)
-          @constraints << [primary, secondary, :mandatory]
-        end
-
+      def set_constraints(name, depends_on:)
         return if depends_on.nil?
 
         primary = option_to_name(depends_on)
-        @constraints << [primary, secondary, :optional]
+        secondary = option_to_name(name)
+        @constraints << [primary, secondary]
       end
 
       def check_constraints
-        @constraints.each do |primary, secondary, constraint_type|
+        @constraints.each do |primary, secondary|
           primary_passed = option_passed?(primary)
           secondary_passed = option_passed?(secondary)
 
+          next if !secondary_passed || (primary_passed && secondary_passed)
+
           primary = name_to_option(primary)
           secondary = name_to_option(secondary)
 
-          if :mandatory.equal?(constraint_type) && primary_passed && !secondary_passed
-            raise OptionConstraintError.new(primary, secondary)
-          end
-          raise OptionConstraintError.new(primary, secondary, missing: true) if secondary_passed && !primary_passed
+          raise OptionConstraintError.new(primary, secondary, missing: true)
         end
       end
 
diff --git a/Library/Homebrew/test/cli/parser_spec.rb b/Library/Homebrew/test/cli/parser_spec.rb
index 54dc168d65..5aaab4683a 100644
--- a/Library/Homebrew/test/cli/parser_spec.rb
+++ b/Library/Homebrew/test/cli/parser_spec.rb
@@ -164,21 +164,15 @@ describe Homebrew::CLI::Parser do
     subject(:parser) {
       described_class.new do
         flag      "--flag1="
+        flag      "--flag2=", depends_on: "--flag1="
         flag      "--flag3="
-        flag      "--flag2=", required_for: "--flag1="
-        flag      "--flag4=", depends_on: "--flag3="
 
         conflicts "--flag1=", "--flag3="
       end
     }
 
-    it "raises exception on required_for constraint violation" do
-      expect { parser.parse(["--flag1=flag1"]) }.to raise_error(Homebrew::CLI::OptionConstraintError)
-    end
-
     it "raises exception on depends_on constraint violation" do
       expect { parser.parse(["--flag2=flag2"]) }.to raise_error(Homebrew::CLI::OptionConstraintError)
-      expect { parser.parse(["--flag4=flag4"]) }.to raise_error(Homebrew::CLI::OptionConstraintError)
     end
 
     it "raises exception for conflict violation" do
@@ -216,20 +210,14 @@ describe Homebrew::CLI::Parser do
       described_class.new do
         switch      "-a", "--switch-a", env: "switch_a"
         switch      "-b", "--switch-b", env: "switch_b"
-        switch      "--switch-c", required_for: "--switch-a"
-        switch      "--switch-d", depends_on: "--switch-b"
+        switch      "--switch-c", depends_on: "--switch-a"
 
         conflicts "--switch-a", "--switch-b"
       end
     }
 
-    it "raises exception on required_for constraint violation" do
-      expect { parser.parse(["--switch-a"]) }.to raise_error(Homebrew::CLI::OptionConstraintError)
-    end
-
     it "raises exception on depends_on constraint violation" do
       expect { parser.parse(["--switch-c"]) }.to raise_error(Homebrew::CLI::OptionConstraintError)
-      expect { parser.parse(["--switch-d"]) }.to raise_error(Homebrew::CLI::OptionConstraintError)
     end
 
     it "raises exception for conflict violation" do