diff --git a/Examples/test-suite/common.mk b/Examples/test-suite/common.mk
index eaf8d38cf..83f420a8a 100644
--- a/Examples/test-suite/common.mk
+++ b/Examples/test-suite/common.mk
@@ -352,7 +352,6 @@ CPP_TEST_CASES += \
 	redefined_not \
 	refcount \
 	reference_global_vars \
-	register_par \
 	rename1 \
 	rename2 \
 	rename3 \
@@ -672,6 +671,7 @@ C_TEST_CASES += \
 	preproc_defined \
 	preproc_include \
 	preproc_line_file \
+	register_par \
 	ret_by_value \
 	simple_array \
 	sizeof_pointer \
diff --git a/Examples/test-suite/register_par.i b/Examples/test-suite/register_par.i
index 030be4556..b4172c059 100644
--- a/Examples/test-suite/register_par.i
+++ b/Examples/test-suite/register_par.i
@@ -1,5 +1,9 @@
 %module register_par
 
+%{
+struct tree;
+%}
+
 // bug # 924413
 %inline {
   void clear_tree_flags(register struct tree *tp, register int i) {}