diff --git a/Library/Homebrew/formula.rb b/Library/Homebrew/formula.rb
index fa4e578d2d..f1123f9246 100644
--- a/Library/Homebrew/formula.rb
+++ b/Library/Homebrew/formula.rb
@@ -2472,11 +2472,20 @@ class Formula
   #
   # @see Utils::Inreplace.inreplace
   # @api public
+  sig {
+    params(
+      paths:        T.any(T::Array[T.untyped], String, Pathname),
+      before:       T.nilable(T.any(Regexp, String)),
+      after:        T.nilable(T.any(Pathname, String, Symbol)),
+      audit_result: T::Boolean,
+    ).void
+  }
   def inreplace(paths, before = nil, after = nil, audit_result = true) # rubocop:disable Style/OptionalBooleanParameter
     super(paths, before, after, audit_result)
   rescue Utils::Inreplace::Error => e
     onoe e.to_s
-    raise BuildError.new(self, "inreplace", paths, {})
+    args = paths.is_a?(Array) ? paths : [paths]
+    raise BuildError.new(self, "inreplace", args, {})
   end
 
   protected
diff --git a/Library/Homebrew/utils/inreplace.rb b/Library/Homebrew/utils/inreplace.rb
index 9e3118a430..c2f627ebea 100644
--- a/Library/Homebrew/utils/inreplace.rb
+++ b/Library/Homebrew/utils/inreplace.rb
@@ -41,12 +41,12 @@ module Utils
       params(
         paths:        T.any(T::Array[T.untyped], String, Pathname),
         before:       T.nilable(T.any(Regexp, String)),
-        after:        T.nilable(T.any(String, Symbol)),
+        after:        T.nilable(T.any(Pathname, String, Symbol)),
         audit_result: T::Boolean,
       ).void
     }
     def inreplace(paths, before = nil, after = nil, audit_result = true) # rubocop:disable Style/OptionalBooleanParameter
-      after = after.to_s if after.is_a? Symbol
+      after &&= after.to_s
 
       errors = {}