diff --git a/Editor/VisualStudioCursorInstallation.cs b/Editor/VisualStudioCursorInstallation.cs
index e27f87c..07234a2 100644
--- a/Editor/VisualStudioCursorInstallation.cs
+++ b/Editor/VisualStudioCursorInstallation.cs
@@ -584,7 +584,12 @@ public override bool Open(string path, int line, int column, string solution)
 			var application = Path;
 
 			var workspace = TryFindWorkspace(directory);
+			// Use version-compatible null-coalescing for Unity 2019.4 (C# 7.3) support
+#if UNITY_2020_2_OR_NEWER
 			workspace ??= directory;
+#else
+			workspace = workspace ?? directory;
+#endif
 			directory = workspace;
 
 			if (EditorPrefs.GetBool(ReuseExistingWindowKey, false))