diff --git a/Mono.Cecil.Cil/Instruction.cs b/Mono.Cecil.Cil/Instruction.cs
index 5fb36049b..b381674bd 100644
--- a/Mono.Cecil.Cil/Instruction.cs
+++ b/Mono.Cecil.Cil/Instruction.cs
@@ -9,6 +9,7 @@
 //
 
 using System;
+using System.Globalization;
 using System.Text;
 
 namespace Mono.Cecil.Cil {
@@ -126,7 +127,7 @@ public override string ToString ()
 				instruction.Append ('\"');
 				break;
 			default:
-				instruction.Append (operand);
+				instruction.Append (Convert.ToString(operand, CultureInfo.InvariantCulture));
 				break;
 			}