diff --git a/lib/arm/instructions/call_instruction.rb b/lib/arm/instructions/call_instruction.rb
index 07b5b765..b2f83dd4 100644
--- a/lib/arm/instructions/call_instruction.rb
+++ b/lib/arm/instructions/call_instruction.rb
@@ -86,7 +86,7 @@ module Arm
       end
     end
     def to_s
-      "#{opcode} #{@first.to_asm} #{super}"
+      "#{opcode} #{@first} #{super}"
     end
   end
 end
diff --git a/lib/arm/instructions/compare_instruction.rb b/lib/arm/instructions/compare_instruction.rb
index aef44c88..ab155791 100644
--- a/lib/arm/instructions/compare_instruction.rb
+++ b/lib/arm/instructions/compare_instruction.rb
@@ -99,7 +99,7 @@ module Arm
       []
     end
     def to_s
-      "#{opcode} #{@left.to_asm} , #{@right.to_asm} #{super}"
+      "#{opcode} #{@left} , #{@right} #{super}"
     end
   end
 end
diff --git a/lib/arm/instructions/stack_instruction.rb b/lib/arm/instructions/stack_instruction.rb
index 93cf16e4..33fd6c69 100644
--- a/lib/arm/instructions/stack_instruction.rb
+++ b/lib/arm/instructions/stack_instruction.rb
@@ -73,7 +73,7 @@ module Arm
       @first
     end
     def to_s
-      "#{opcode} [#{@first.collect {|f| f.to_asm}.join(',') }] #{super}"
+      "#{opcode} [#{@first.join(',') }] #{super}"
     end
   end
 
diff --git a/test/arm/arm-helper.rb b/test/arm/arm-helper.rb
index 19b48ed0..34bdb19c 100644
--- a/test/arm/arm-helper.rb
+++ b/test/arm/arm-helper.rb
@@ -5,8 +5,8 @@ require_relative '../helper'
 # tests are named as per assembler code, ie test_mov testing mov instruction
 #  adc add and bic eor orr rsb rsc sbc sub mov mvn cmn cmp teq tst b call bx swi strb
 
-module ArmHelper 
-  # need Assembler and a block (see those classes) 
+module ArmHelper
+  # need Assembler and a block (see those classes)
   def setup
     @machine = Arm::ArmMachine
   end