diff --git a/Library/Homebrew/formula.rb b/Library/Homebrew/formula.rb
index e97ebd9d52..00b55f5a00 100644
--- a/Library/Homebrew/formula.rb
+++ b/Library/Homebrew/formula.rb
@@ -2559,10 +2559,11 @@ class Formula
       before:       T.nilable(T.any(Pathname, Regexp, String)),
       after:        T.nilable(T.any(Pathname, String, Symbol)),
       audit_result: T::Boolean,
+      blk:          T.nilable(T.proc.params(s: StringInreplaceExtension).void),
     ).void
   }
-  def inreplace(paths, before = nil, after = nil, audit_result = true) # rubocop:disable Style/OptionalBooleanParameter
-    Utils::Inreplace.inreplace(paths, before, after, audit_result: audit_result)
+  def inreplace(paths, before = nil, after = nil, audit_result = true, &blk) # rubocop:disable Style/OptionalBooleanParameter
+    Utils::Inreplace.inreplace(paths, before, after, audit_result: audit_result, &blk)
   rescue Utils::Inreplace::Error => e
     onoe e.to_s
     raise BuildError.new(self, "inreplace", Array(paths), {})
diff --git a/Library/Homebrew/utils/inreplace.rb b/Library/Homebrew/utils/inreplace.rb
index 9743c1608a..1cd7da37e9 100644
--- a/Library/Homebrew/utils/inreplace.rb
+++ b/Library/Homebrew/utils/inreplace.rb
@@ -41,9 +41,10 @@ module Utils
         before:       T.nilable(T.any(Pathname, Regexp, String)),
         after:        T.nilable(T.any(Pathname, String, Symbol)),
         audit_result: T::Boolean,
+        blk:          T.nilable(T.proc.params(s: StringInreplaceExtension).void),
       ).void
     }
-    def self.inreplace(paths, before = nil, after = nil, audit_result: true)
+    def self.inreplace(paths, before = nil, after = nil, audit_result: true, &blk)
       paths = Array(paths)
       after &&= after.to_s
       before = before.to_s if before.is_a?(Pathname)
@@ -57,6 +58,8 @@ module Utils
         s = StringInreplaceExtension.new(str)
 
         if before.nil? && after.nil?
+          raise ArgumentError, "Must supply a block or before/after params" unless blk
+
           yield s
         else
           s.gsub!(T.must(before), T.must(after), audit_result)