diff --git a/lib/quickdraw/test.rb b/lib/quickdraw/test.rb
index 94ba6c4..0c7720f 100644
--- a/lib/quickdraw/test.rb
+++ b/lib/quickdraw/test.rb
@@ -49,8 +49,16 @@ def assert(value)
 		nil
 	end
 
-	def refute(value, ...)
-		assert(!value, ...)
+	def refute(value)
+		if !value
+			success!
+		elsif block_given?
+			failure! { yield(value) }
+		else
+			failure! { "expected #{value.inspect} to be falsy" }
+		end
+
+		nil
 	end
 
 	# Indicate that an assertion passed successfully.
diff --git a/test/quickdraw.test.rb b/test/quickdraw.test.rb
index af68a27..08470ce 100644
--- a/test/quickdraw.test.rb
+++ b/test/quickdraw.test.rb
@@ -15,3 +15,17 @@
 test "refute", skip: true do
 	refute true
 end
+
+test "refute custom message" do
+	runner = assert_test(failures: 1) do
+		refute(32) { |val| "#{val} not falsy" }
+	end
+	assert_equal runner.failures.last["message"], "32 not falsy"
+end
+
+test "refute default message" do
+	runner = assert_test(failures: 1) do
+		refute 32
+	end
+	assert_equal runner.failures.last["message"], "expected 32 to be falsy"
+end