diff --git a/Objects/xxobject.c b/Objects/xxobject.c
index 8edf689e186..bfe9c842889 100644
--- a/Objects/xxobject.c
+++ b/Objects/xxobject.c
@@ -35,6 +35,7 @@ OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 /* Xx objects */
 
 #include "allobjects.h"
+#include "modsupport.h"		/* For getargs() etc. */
 
 typedef struct {
 	OB_HEAD
diff --git a/Python/sysmodule.c b/Python/sysmodule.c
index a12595caa8f..3a6516ffa44 100644
--- a/Python/sysmodule.c
+++ b/Python/sysmodule.c
@@ -102,7 +102,7 @@ sys_settrace(self, args)
 	if (args == None)
 		args = NULL;
 	else
-		INCREF(args);
+		XINCREF(args);
 	XDECREF(sys_trace);
 	sys_trace = args;
 	INCREF(None);
@@ -117,7 +117,7 @@ sys_setprofile(self, args)
 	if (args == None)
 		args = NULL;
 	else
-		INCREF(args);
+		XINCREF(args);
 	XDECREF(sys_profile);
 	sys_profile = args;
 	INCREF(None);