diff --git a/Library/Homebrew/debrew.rb b/Library/Homebrew/debrew.rb
index 661d9e7428..05acc2da8b 100644
--- a/Library/Homebrew/debrew.rb
+++ b/Library/Homebrew/debrew.rb
@@ -102,7 +102,7 @@ module Debrew
     raise(exception) if !active? || !debugged_exceptions.add?(exception) || !mu_try_lock
 
     begin
-      puts exception.backtrace.first.to_s
+      puts exception.backtrace.first
       puts Formatter.error(exception, label: exception.class.name)
 
       loop do
diff --git a/Library/Homebrew/test/language/node_spec.rb b/Library/Homebrew/test/language/node_spec.rb
index dc80eed2f8..36f1eefd8c 100644
--- a/Library/Homebrew/test/language/node_spec.rb
+++ b/Library/Homebrew/test/language/node_spec.rb
@@ -45,14 +45,12 @@ describe Language::Node do
 
     it "raises error with non zero exitstatus" do
       allow(Utils).to receive(:popen_read).with(*npm_pack_cmd).and_return(`false`)
-      expect { described_class.std_npm_install_args(npm_install_arg) }.to \
-        raise_error("npm failed to pack #{Dir.pwd}")
+      expect { described_class.std_npm_install_args(npm_install_arg) }.to raise_error("npm failed to pack #{Dir.pwd}")
     end
 
     it "raises error with empty npm pack output" do
       allow(Utils).to receive(:popen_read).with(*npm_pack_cmd).and_return(`true`)
-      expect { described_class.std_npm_install_args(npm_install_arg) }.to \
-        raise_error("npm failed to pack #{Dir.pwd}")
+      expect { described_class.std_npm_install_args(npm_install_arg) }.to raise_error("npm failed to pack #{Dir.pwd}")
     end
 
     it "does not raise error with a zero exitstatus" do