diff --git a/tests/server/src/cases/issues/Issue12001.hx b/tests/server/src/cases/issues/Issue12001.hx
new file mode 100644
index 00000000000..e0bcbb2a7f7
--- /dev/null
+++ b/tests/server/src/cases/issues/Issue12001.hx
@@ -0,0 +1,29 @@
+package cases.issues;
+
+import haxe.display.Diagnostic;
+
+class Issue12001 extends TestCase {
+	function testDefineType(_) {
+		vfs.putContent("Macro.hx", getTemplate("issues/Issue12001/Macro.hx"));
+		vfs.putContent("Empty.hx", getTemplate("Empty.hx"));
+		var args = ["-main", "Empty", "--macro", "Macro.defineType()"];
+		runHaxe(args);
+		assertSuccess();
+
+		runHaxe(args);
+		Assert.isFalse(0 == errorMessages.length);
+		assertErrorMessage("Cannot redefine module Foo");
+	}
+
+	function testDefineModule(_) {
+		vfs.putContent("Macro.hx", getTemplate("issues/Issue12001/Macro.hx"));
+		vfs.putContent("Empty.hx", getTemplate("Empty.hx"));
+		var args = ["-main", "Empty", "--macro", "Macro.defineModule()"];
+		runHaxe(args);
+		assertSuccess();
+
+		runHaxe(args);
+		Assert.isFalse(0 == errorMessages.length);
+		assertErrorMessage("Cannot redefine module Bar");
+	}
+}
diff --git a/tests/server/test/templates/issues/Issue12001/Macro.hx b/tests/server/test/templates/issues/Issue12001/Macro.hx
new file mode 100644
index 00000000000..ceb17417576
--- /dev/null
+++ b/tests/server/test/templates/issues/Issue12001/Macro.hx
@@ -0,0 +1,25 @@
+import haxe.macro.Context;
+
+function defineType() {
+	Context.onAfterInitMacros(() -> {
+		Context.defineType({
+			pos: Context.currentPos(),
+			pack: [],
+			name: "Foo",
+			kind: TDAbstract(macro:String, [], [], []),
+			fields: []
+		});
+	});
+}
+
+function defineModule() {
+	Context.onAfterInitMacros(() -> {
+		Context.defineModule("Bar", [{
+			pos: Context.currentPos(),
+			pack: [],
+			name: "Bar",
+			kind: TDAbstract(macro:String, [], [], []),
+			fields: []
+		}]);
+	});
+}