diff --git a/FFMpegCore.Test/ArgumentBuilderTest.cs b/FFMpegCore.Test/ArgumentBuilderTest.cs
index de625e2..aa1c878 100644
--- a/FFMpegCore.Test/ArgumentBuilderTest.cs
+++ b/FFMpegCore.Test/ArgumentBuilderTest.cs
@@ -197,7 +197,7 @@ public void Builder_BuildString_Loop()
         public void Builder_BuildString_Seek()
         {
             var str = FFMpegArguments.FromFileInput("input.mp4", false, opt => opt.Seek(TimeSpan.FromSeconds(10))).OutputToFile("output.mp4", false, opt => opt.Seek(TimeSpan.FromSeconds(10))).Arguments;
-            Assert.AreEqual("-ss 00:00:10 -i \"input.mp4\" -ss 00:00:10 \"output.mp4\"", str);
+            Assert.AreEqual("-ss 00:00:10.000 -i \"input.mp4\" -ss 00:00:10.000 \"output.mp4\"", str);
         }
 
         [TestMethod]
diff --git a/FFMpegCore/FFMpeg/Arguments/SeekArgument.cs b/FFMpegCore/FFMpeg/Arguments/SeekArgument.cs
index 1057b88..1b58890 100644
--- a/FFMpegCore/FFMpeg/Arguments/SeekArgument.cs
+++ b/FFMpegCore/FFMpeg/Arguments/SeekArgument.cs
@@ -8,11 +8,28 @@ namespace FFMpegCore.Arguments
     public class SeekArgument : IArgument
     {
         public readonly TimeSpan? SeekTo;
+
         public SeekArgument(TimeSpan? seekTo)
         {
             SeekTo = seekTo;
         }
-        
-        public string Text => !SeekTo.HasValue ? string.Empty : $"-ss {SeekTo.Value}";
+
+        public string Text {
+            get { 
+                if(SeekTo.HasValue)
+                {
+                    int hours = SeekTo.Value.Hours;
+                    if(SeekTo.Value.Days > 0)
+                    {
+                        hours += SeekTo.Value.Days * 24;
+                    }
+                    return $"-ss {hours.ToString("00")}:{SeekTo.Value.Minutes.ToString("00")}:{SeekTo.Value.Seconds.ToString("00")}.{SeekTo.Value.Milliseconds.ToString("000")}";
+                }
+                else
+                {
+                    return string.Empty;
+                }
+            }
+        }
     }
 }