diff --git a/Objects/fileobject.c b/Objects/fileobject.c
index db9a088eb1d..e925b4d3244 100644
--- a/Objects/fileobject.c
+++ b/Objects/fileobject.c
@@ -25,6 +25,7 @@ OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 /* File object implementation */
 
 #include "allobjects.h"
+#include "modsupport.h"
 
 #define BUF(v) GETSTRINGVALUE((stringobject *)v)
 
diff --git a/Objects/listobject.c b/Objects/listobject.c
index 5811f406e48..156cda1c2f4 100644
--- a/Objects/listobject.c
+++ b/Objects/listobject.c
@@ -25,6 +25,7 @@ OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 /* List object implementation */
 
 #include "allobjects.h"
+#include "modsupport.h"
 
 object *
 newlistobject(size)