diff --git a/plist-cil.test/NSNumberTests.cs b/plist-cil.test/NSNumberTests.cs
index 8dfdfc3..c466b9e 100644
--- a/plist-cil.test/NSNumberTests.cs
+++ b/plist-cil.test/NSNumberTests.cs
@@ -2,8 +2,10 @@
 using NUnit.Framework;
 using System;
 using System.Collections.Generic;
+using System.Globalization;
 using System.Linq;
 using System.Text;
+using System.Threading;
 using System.Threading.Tasks;
 
 namespace plistcil.test
@@ -18,5 +20,56 @@ namespace plistcil.test
             Assert.AreEqual(NSNumber.INTEGER, number.GetNSNumberType());
             Assert.AreEqual(10032936613, number.ToObject());
         }
+
+        // The tests below make sure the numbers are being parsed correctly, and do not depend on the culture info
+        // being set. Especially, decimal point may vary between cultures and we don't want to take a dependency on that
+        // The value being used comes seen in a real property list:
+        // <key>TimeZoneOffsetFromUTC</key>
+        // <real>7200.000000</real>
+
+        [Test]
+        [SetCulture("en-US")]
+        public static void ParseNumberEnTest()
+        {
+            var number = new NSNumber("7200.000001");
+            Assert.IsTrue(number.isReal());
+            Assert.AreEqual(7200.000001d, number.ToDouble());
+        }
+
+        [Test]
+        [SetCulture("nl-BE")]
+        public static void ParseNumberNlTest()
+        {
+            // As seen in a real property list:
+            // <key>TimeZoneOffsetFromUTC</key>
+            // <real>7200.000000</real>
+            var number = new NSNumber("7200.000001");
+            Assert.IsTrue(number.isReal());
+            Assert.AreEqual(7200.000001d, number.ToDouble());
+        }
+
+        [Test]
+        [SetCulture("en-US")]
+        public static void ParseNumberEnTest2()
+        {
+            // As seen in a real property list:
+            // <key>TimeZoneOffsetFromUTC</key>
+            // <real>7200.000000</real>
+            var number = new NSNumber("7200.000000", NSNumber.REAL);
+            Assert.IsTrue(number.isReal());
+            Assert.AreEqual(7200d, number.ToDouble());
+        }
+
+        [Test]
+        [SetCulture("nl-BE")]
+        public static void ParseNumberNlTest2()
+        {
+            // As seen in a real property list:
+            // <key>TimeZoneOffsetFromUTC</key>
+            // <real>7200.000000</real>
+            var number = new NSNumber("7200.000000", NSNumber.REAL);
+            Assert.IsTrue(number.isReal());
+            Assert.AreEqual(7200d, number.ToDouble());
+        }
     }
 }
diff --git a/plist-cil/NSNumber.cs b/plist-cil/NSNumber.cs
index 9614da1..8809d0f 100644
--- a/plist-cil/NSNumber.cs
+++ b/plist-cil/NSNumber.cs
@@ -94,12 +94,12 @@ namespace Claunia.PropertyList
             {
                 case INTEGER:
                     {
-                        doubleValue = longValue = long.Parse(text);
+                        doubleValue = longValue = long.Parse(text, CultureInfo.InvariantCulture);
                         break;
                     }
                 case REAL:
                     {
-                        doubleValue = double.Parse(text);
+                        doubleValue = double.Parse(text, CultureInfo.InvariantCulture);
                         longValue = (long)Math.Round(doubleValue);
                         break;
                     }
@@ -126,12 +126,12 @@ namespace Claunia.PropertyList
             long l;
             double d;
 
-            if (long.TryParse(text, out l))
+            if (long.TryParse(text, NumberStyles.Number, CultureInfo.InvariantCulture, out l))
             {
                 doubleValue = longValue = l;
                 type = INTEGER;
             }
-            else if (double.TryParse(text, out d))
+            else if (double.TryParse(text, NumberStyles.Number, CultureInfo.InvariantCulture, out d))
             {
                 doubleValue = d;
                 longValue = (long)Math.Round(doubleValue);
@@ -139,8 +139,8 @@ namespace Claunia.PropertyList
             }
             else
             {
-                bool isTrue = text.ToLower().Equals("true") || text.ToLower().Equals("yes");
-                bool isFalse = text.ToLower().Equals("false") || text.ToLower().Equals("no");
+                bool isTrue = string.Equals(text, "true", StringComparison.InvariantCultureIgnoreCase) || string.Equals(text, "yes", StringComparison.InvariantCultureIgnoreCase);
+                bool isFalse = string.Equals(text, "false", StringComparison.InvariantCultureIgnoreCase) || string.Equals(text, "no", StringComparison.InvariantCultureIgnoreCase);
 
                 if (isTrue || isFalse)
                 {