diff --git a/Modules/_testcapimodule.c b/Modules/_testcapimodule.c
index 41d059b2e48..014c2f325af 100644
--- a/Modules/_testcapimodule.c
+++ b/Modules/_testcapimodule.c
@@ -5194,7 +5194,7 @@ static PyMethodDef generic_alias_methods[] = {
     {NULL}  /* sentinel */
 };
 
-PyTypeObject GenericAlias_Type = {
+static PyTypeObject GenericAlias_Type = {
     PyVarObject_HEAD_INIT(NULL, 0)
     "GenericAlias",
     sizeof(PyGenericAliasObject),
@@ -5231,7 +5231,7 @@ static PyMethodDef generic_methods[] = {
     {NULL}  /* sentinel */
 };
 
-PyTypeObject Generic_Type = {
+static PyTypeObject Generic_Type = {
     PyVarObject_HEAD_INIT(NULL, 0)
     "Generic",
     sizeof(PyGenericObject),