diff --git a/.gitignore b/.gitignore
index a1e5f6ad2..15fbf331d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,7 +1,6 @@
 bin/
 obj/
 
-/ILSpy-tests
 /ICSharpCode.Decompiler/Properties/AssemblyInfo.cs
 /ILSpy/Properties/AssemblyInfo.cs
 /ILSpy/app.config
diff --git a/.gitmodules b/.gitmodules
index 41918909b..d1593580e 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,6 @@
 [submodule "cecil"]
 	path = cecil
 	url = https://github.com/jbevain/cecil.git
+[submodule "ILSpy-tests"]
+	path = ILSpy-tests
+	url = https://github.com/icsharpcode/ILSpy-tests
diff --git a/ILSpy-tests b/ILSpy-tests
new file mode 160000
index 000000000..e8c3f0e9e
--- /dev/null
+++ b/ILSpy-tests
@@ -0,0 +1 @@
+Subproject commit e8c3f0e9e811b9f67090ac6ee445d9cc3e52f82a
diff --git a/appveyor.yml b/appveyor.yml
index 36241bde9..1212f2c0f 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -4,7 +4,6 @@ platform: Any CPU
 image: Visual Studio 2017
 install:
 - git submodule update --init --recursive
-- git clone https://github.com/icsharpcode/ILSpy-tests
 before_build:
 - nuget restore ILSpy.sln
 build: