diff --git a/OpenTween.Tests/MyCommonTest.cs b/OpenTween.Tests/MyCommonTest.cs
index 15a0f8cbb..e21a5e067 100644
--- a/OpenTween.Tests/MyCommonTest.cs
+++ b/OpenTween.Tests/MyCommonTest.cs
@@ -172,13 +172,13 @@ public void ReplaceAppNameTest(string str, string excepted)
             => Assert.Equal(excepted, MyCommon.ReplaceAppName(str, "OpenTween"));
 
         [Theory]
-        [InlineData("1.0.0.0", "1.0.0")]
-        [InlineData("1.0.0.1", "1.0.1-dev")]
-        [InlineData("1.0.0.12", "1.0.1-dev+build.12")]
-        [InlineData("1.0.1.0", "1.0.1")]
-        [InlineData("1.0.9.1", "1.0.10-dev")]
-        [InlineData("1.1.0.0", "1.1.0")]
-        [InlineData("1.9.9.1", "1.9.10-dev")]
+        [InlineData("1.0.0.0", "1.0.0+mastodon")]
+        [InlineData("1.0.0.1", "1.0.1-dev+mastodon")]
+        [InlineData("1.0.0.12", "1.0.1-dev+mastodon+build.12")]
+        [InlineData("1.0.1.0", "1.0.1+mastodon")]
+        [InlineData("1.0.9.1", "1.0.10-dev+mastodon")]
+        [InlineData("1.1.0.0", "1.1.0+mastodon")]
+        [InlineData("1.9.9.1", "1.9.10-dev+mastodon")]
         public void GetReadableVersionTest(string fileVersion, string expected)
             => Assert.Equal(expected, MyCommon.GetReadableVersion(fileVersion));