diff --git a/FFMpegCore.Test/ArgumentBuilderTest.cs b/FFMpegCore.Test/ArgumentBuilderTest.cs
index 5f2ce5c..9a358ae 100644
--- a/FFMpegCore.Test/ArgumentBuilderTest.cs
+++ b/FFMpegCore.Test/ArgumentBuilderTest.cs
@@ -353,10 +353,10 @@ public void Builder_BuildString_SubtitleHardBurnFilterFixedPaths()
                 .OutputToFile("output.mp4", false, opt => opt
                     .WithVideoFilters(filterOptions => filterOptions
                         .HardBurnSubtitle(SubtitleHardBurnOptions
-                            .Create(subtitlePath: @"sample( \ : [ ] , ).srt"))))
+                            .Create(subtitlePath: @"sample( \ : [ ] , ' ).srt"))))
                 .Arguments;
 
-            Assert.AreEqual(@"-i ""input.mp4"" -vf ""subtitles='sample( \\ \: \[ \] \, ).srt'"" ""output.mp4""",
+            Assert.AreEqual(@"-i ""input.mp4"" -vf ""subtitles='sample( \\ \: \[ \] \, '\\\'' ).srt'"" ""output.mp4""",
                 str);
         }
 
diff --git a/FFMpegCore/Extend/StringExtensions.cs b/FFMpegCore/Extend/StringExtensions.cs
index 7afcc34..2c33681 100644
--- a/FFMpegCore/Extend/StringExtensions.cs
+++ b/FFMpegCore/Extend/StringExtensions.cs
@@ -7,11 +7,11 @@ internal static class StringExtensions
     {
         private static Dictionary<char, string> CharactersSubstitution { get; } = new Dictionary<char, string>
         {
-            {'\\', @"\\"},
-            {':', @"\:"},
-            {'[', @"\["},
-            {']', @"\]"},
-            // {'\'', @"\'"} TODO: Quotes need to be escaped but i failed miserably
+            { '\\', @"\\" },
+            { ':', @"\:" },
+            { '[', @"\[" },
+            { ']', @"\]" },
+            { '\'', @"'\\\''" }
         };
 
         /// <summary>