diff --git a/Library/Homebrew/dependency.rb b/Library/Homebrew/dependency.rb
index 6f3b88c8a2..8896435b67 100644
--- a/Library/Homebrew/dependency.rb
+++ b/Library/Homebrew/dependency.rb
@@ -230,6 +230,7 @@ end
 class UsesFromMacOSDependency < Dependency
   attr_reader :bounds
 
+  sig { params(name: String, tags: T::Array[Symbol], bounds: T::Hash[Symbol, Symbol]).void }
   def initialize(name, tags = [], bounds:)
     super(name, tags)
 
diff --git a/Library/Homebrew/formula.rb b/Library/Homebrew/formula.rb
index 9120a5cd8d..1a22f760b0 100644
--- a/Library/Homebrew/formula.rb
+++ b/Library/Homebrew/formula.rb
@@ -3371,12 +3371,12 @@ class Formula
     # On Linux this will act as {.depends_on}.
     sig {
       params(
-        dep:    String,
-        bounds: T.any(Symbol, T::Array[Symbol]),
+        dep:    T.any(String, T::Hash[T.any(String, Symbol), T.any(Symbol, T::Array[Symbol])]),
+        bounds: T::Hash[Symbol, Symbol],
       ).void
     }
-    def uses_from_macos(dep = T.unsafe(nil), **bounds)
-      specs.each { |spec| spec.uses_from_macos(*dep, **bounds) }
+    def uses_from_macos(dep, bounds = {})
+      specs.each { |spec| spec.uses_from_macos(dep, bounds) }
     end
 
     # @!attribute [w] option
diff --git a/Library/Homebrew/formulary.rb b/Library/Homebrew/formulary.rb
index 2cfe6b8f0e..584f4f4431 100644
--- a/Library/Homebrew/formulary.rb
+++ b/Library/Homebrew/formulary.rb
@@ -237,10 +237,9 @@ module Formulary
         bounds.deep_transform_values!(&:to_sym)
 
         if dep.is_a?(Hash)
-          dep.deep_transform_values!(&:to_sym)
-          uses_from_macos(**T.unsafe(dep.merge(bounds)))
+          uses_from_macos dep.deep_transform_values(&:to_sym).merge(bounds)
         else
-          uses_from_macos dep, **bounds
+          uses_from_macos dep, bounds
         end
       end
     end
diff --git a/Library/Homebrew/software_spec.rb b/Library/Homebrew/software_spec.rb
index a6e9776aa2..8dd3630877 100644
--- a/Library/Homebrew/software_spec.rb
+++ b/Library/Homebrew/software_spec.rb
@@ -188,18 +188,19 @@ class SoftwareSpec
 
   sig {
     params(
-      dep:    String,
-      bounds: T.any(Symbol, T::Array[Symbol]),
+      dep:    T.any(String, T::Hash[T.any(String, Symbol), T.any(Symbol, T::Array[Symbol])]),
+      bounds: T::Hash[Symbol, Symbol],
     ).void
   }
-  def uses_from_macos(dep = T.unsafe(nil), **bounds)
-    bounds = bounds.dup
-
-    if dep
-      tags = []
-    else
+  def uses_from_macos(dep, bounds = {})
+    if dep.is_a?(Hash)
+      bounds = dep.dup
       dep, tags = bounds.shift
+      dep = T.cast(dep, String)
       tags = [*tags]
+      bounds = T.cast(bounds, T::Hash[Symbol, Symbol])
+    else
+      tags = []
     end
 
     depends_on UsesFromMacOSDependency.new(dep, tags, bounds: bounds)