diff --git a/ICSharpCode.Decompiler/Solution/SolutionCreator.cs b/ICSharpCode.Decompiler/Solution/SolutionCreator.cs
index 749a772c0..ea21a82a7 100644
--- a/ICSharpCode.Decompiler/Solution/SolutionCreator.cs
+++ b/ICSharpCode.Decompiler/Solution/SolutionCreator.cs
@@ -41,7 +41,7 @@ namespace ICSharpCode.Decompiler.Solution
 		/// <exception cref="ArgumentException">Thrown when <paramref name="targetFile"/> is null or empty.</exception>
 		/// <exception cref="ArgumentNullException">Thrown when <paramref name="projects"/> is null.</exception>
 		/// <exception cref="InvalidOperationException">Thrown when <paramref name="projects"/> contains no items.</exception>
-		public static void WriteSolutionFile(string targetFile, IEnumerable<ProjectItem> projects)
+		public static void WriteSolutionFile(string targetFile, List<ProjectItem> projects)
 		{
 			if (string.IsNullOrWhiteSpace(targetFile))
 			{
@@ -53,19 +53,17 @@ namespace ICSharpCode.Decompiler.Solution
 				throw new ArgumentNullException(nameof(projects));
 			}
 
-			var projectList = projects.ToList();
-
-			if (!projectList.Any())
+			if (!projects.Any())
 			{
 				throw new InvalidOperationException("At least one project is expected.");
 			}
 
 			using (var writer = new StreamWriter(targetFile))
 			{
-				WriteSolutionFile(writer, projectList, targetFile);
+				WriteSolutionFile(writer, projects, targetFile);
 			}
 
-			FixProjectReferences(projectList);
+			FixProjectReferences(projects);
 		}
 
 		static void WriteSolutionFile(TextWriter writer, List<ProjectItem> projects, string solutionFilePath)
diff --git a/ILSpy/SolutionWriter.cs b/ILSpy/SolutionWriter.cs
index 29e8db8b0..06d71e701 100644
--- a/ILSpy/SolutionWriter.cs
+++ b/ILSpy/SolutionWriter.cs
@@ -153,8 +153,8 @@ namespace ICSharpCode.ILSpy
 				}
 				else
 				{
-					await Task.Run(() => SolutionCreator.WriteSolutionFile(solutionFilePath, projects))
-						.ConfigureAwait(false);
+					await Task.Run(() => SolutionCreator.WriteSolutionFile(solutionFilePath, projects.ToList()))
+							.ConfigureAwait(false);
 				}
 			}
 			catch (AggregateException ae)