diff --git a/tests/Makefile.am b/tests/Makefile.am
index af26cfab1..ff4b8a4ee 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -75,12 +75,13 @@ MODFILES = \
 	example1_with_tags.mod \
 	example1_irf_shocks.mod \
 	example1_abs_sign.mod \
-	example1_macro.mod \
 	example1_mlv.mod \
 	example1long.mod \
 	example2long.mod \
 	example2long_use_dll.mod \
 	t_sgu_ex1.mod \
+	macro_processor/test_ifndef.mod \
+	macro_processor/example1_macro.mod \
 	irfs/example1_unit_std.mod \
 	optimal_policy/OSR/osr_example.mod \
 	optimal_policy/OSR/osr_example_objective_correctness.mod \
diff --git a/tests/example1_macro.mod b/tests/macro_processor/example1_macro.mod
similarity index 100%
rename from tests/example1_macro.mod
rename to tests/macro_processor/example1_macro.mod
diff --git a/tests/macro_processor/test_ifndef.mod b/tests/macro_processor/test_ifndef.mod
new file mode 100644
index 000000000..2a846473e
--- /dev/null
+++ b/tests/macro_processor/test_ifndef.mod
@@ -0,0 +1,17 @@
+// test ifndef to prevent regressions like #1747
+@#define marco=1
+@#ifndef marco
+    def=0;
+@#else
+    def=1;
+@#endif
+
+if ~def
+    error('ifndef not reached')
+end
+
+var x;
+
+model;
+x;
+end;
\ No newline at end of file