diff --git a/src/FirebirdSql.EntityFrameworkCore.Firebird.Tests/Storage/FbTimeSpanTypeMappingTests.cs b/src/FirebirdSql.EntityFrameworkCore.Firebird.Tests/Storage/FbTimeSpanTypeMappingTests.cs
new file mode 100644
index 000000000..95f76427c
--- /dev/null
+++ b/src/FirebirdSql.EntityFrameworkCore.Firebird.Tests/Storage/FbTimeSpanTypeMappingTests.cs
@@ -0,0 +1,34 @@
+/*
+ *    The contents of this file are subject to the Initial
+ *    Developer's Public License Version 1.0 (the "License");
+ *    you may not use this file except in compliance with the
+ *    License. You may obtain a copy of the License at
+ *    https://github.com/FirebirdSQL/NETProvider/raw/master/license.txt.
+ *
+ *    Software distributed under the License is distributed on
+ *    an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either
+ *    express or implied. See the License for the specific
+ *    language governing rights and limitations under the License.
+ *
+ *    All Rights Reserved.
+ */
+
+//$Authors = Niek Schoemaker
+
+using System;
+using FirebirdSql.Data.FirebirdClient;
+using FirebirdSql.EntityFrameworkCore.Firebird.Storage.Internal;
+using NUnit.Framework;
+
+namespace FirebirdSql.EntityFrameworkCore.Firebird.Tests.Storage;
+
+public class FbTimeSpanTypeMappingTests
+{
+	[Test]
+	public void GeneratesTimeLiteral()
+	{
+		var mapping = new FbTimeSpanTypeMapping("TIME", FbDbType.Time);
+
+		Assert.AreEqual("CAST('07:08:09.1234' AS TIME)", mapping.GenerateSqlLiteral(new TimeSpan(0, 7, 8, 9, 123) + TimeSpan.FromTicks(4000)));
+	}
+}
diff --git a/src/FirebirdSql.EntityFrameworkCore.Firebird/Storage/Internal/FbTimeSpanTypeMapping.cs b/src/FirebirdSql.EntityFrameworkCore.Firebird/Storage/Internal/FbTimeSpanTypeMapping.cs
index 0dac60aff..35c4a459d 100644
--- a/src/FirebirdSql.EntityFrameworkCore.Firebird/Storage/Internal/FbTimeSpanTypeMapping.cs
+++ b/src/FirebirdSql.EntityFrameworkCore.Firebird/Storage/Internal/FbTimeSpanTypeMapping.cs
@@ -48,7 +48,7 @@ protected override string GenerateNonNullSqlLiteral(object value)
 		switch (_fbDbType)
 		{
 			case FbDbType.Time:
-				return $"CAST('{value:hh\\:mm\\:ss.ffff}' AS TIME)";
+				return $"CAST('{value:hh\\:mm\\:ss\\.ffff}' AS TIME)";
 			default:
 				throw new ArgumentOutOfRangeException(nameof(_fbDbType), $"{nameof(_fbDbType)}={_fbDbType}");
 		}