diff --git a/regression/CMakeLists.txt b/regression/CMakeLists.txt
index a02a538e17..eac1a0894f 100644
--- a/regression/CMakeLists.txt
+++ b/regression/CMakeLists.txt
@@ -23,3 +23,4 @@
     add_subdirectory(regression)
     add_subdirectory(stationlist)
     add_subdirectory(gs)
+    add_subdirectory(gs_compat)
diff --git a/regression/gs_compat/CMakeLists.txt b/regression/gs_compat/CMakeLists.txt
new file mode 100644
index 0000000000..e58fb9ba0c
--- /dev/null
+++ b/regression/gs_compat/CMakeLists.txt
@@ -0,0 +1,7 @@
+include(CreateRegression)
+create_regression("game"
+    ${CMAKE_CURRENT_SOURCE_DIR}/info.nut
+    ${CMAKE_CURRENT_SOURCE_DIR}/main.nut
+    ${CMAKE_CURRENT_SOURCE_DIR}/result.txt
+    ${CMAKE_CURRENT_SOURCE_DIR}/test.sav
+)
diff --git a/regression/gs_compat/info.nut b/regression/gs_compat/info.nut
new file mode 100644
index 0000000000..4c407a7886
--- /dev/null
+++ b/regression/gs_compat/info.nut
@@ -0,0 +1,13 @@
+class CompatRegression extends GSInfo {
+	function GetAuthor()      { return "OpenTTD GS Developers Team"; }
+	function GetName()        { return "Compat Regression"; }
+	function GetShortName()   { return "REGC"; }
+	function GetDescription() { return "This runs regression on the compat scripts."; }
+	function GetVersion()     { return 1; }
+	function GetAPIVersion()  { return "1.2"; }
+	function GetDate()        { return "2026-05-19"; }
+	function CreateInstance() { return "CompatRegression"; }
+	function UseAsRandomAI()  { return false; }
+}
+
+RegisterGS(CompatRegression());
diff --git a/regression/gs_compat/main.nut b/regression/gs_compat/main.nut
new file mode 100644
index 0000000000..f7c10eff53
--- /dev/null
+++ b/regression/gs_compat/main.nut
@@ -0,0 +1,6 @@
+class CompatRegression extends GSController {
+	function Start()
+	{
+		print("Done...");
+	}
+};
diff --git a/regression/gs_compat/result.txt b/regression/gs_compat/result.txt
new file mode 100644
index 0000000000..87b3caffb4
--- /dev/null
+++ b/regression/gs_compat/result.txt
@@ -0,0 +1,2 @@
+Done...
+ERROR: The script died unexpectedly.
diff --git a/regression/gs_compat/test.sav b/regression/gs_compat/test.sav
new file mode 100644
index 0000000000..45610f05e3
Binary files /dev/null and b/regression/gs_compat/test.sav differ