diff --git a/lib/method_source/code_helpers.rb b/lib/method_source/code_helpers.rb
index 4185c18..9eb8cdd 100644
--- a/lib/method_source/code_helpers.rb
+++ b/lib/method_source/code_helpers.rb
@@ -92,6 +92,8 @@ def complete_expression?(str)
     def extract_first_expression(lines, consume=0, &block)
       code = consume.zero? ? +"" : lines.slice!(0..(consume - 1)).join
 
+      return code if !code.empty? && complete_expression?(block ? block.call(code) : code)
+
       lines.each do |v|
         code << v
         return code if complete_expression?(block ? block.call(code) : code)
diff --git a/spec/method_source/code_helpers_spec.rb b/spec/method_source/code_helpers_spec.rb
index 287ff89..5efba8f 100644
--- a/spec/method_source/code_helpers_spec.rb
+++ b/spec/method_source/code_helpers_spec.rb
@@ -5,6 +5,10 @@
     @tester = Object.new.extend(MethodSource::CodeHelpers)
   end
 
+  it "returns a complete explicitly consumed prefix" do
+    expect(@tester.expression_at("7\n9\n", 1, consume: 1)).to eq("7\n")
+  end
+
   [
     ["p = '", "'"],
     ["def", "a", "(); end"],