diff --git a/Modules/arraymodule.c b/Modules/arraymodule.c
index e396716..9c30a14 100644
--- a/Modules/arraymodule.c
+++ b/Modules/arraymodule.c
@@ -2211,14 +2211,14 @@
 		     cur += step, i++) {
 			Py_ssize_t lim = step - 1;
 
-			if (cur + step >= Py_SIZE(self))
+			if (cur + step >= (size_t)Py_SIZE(self))
 				lim = Py_SIZE(self) - cur - 1;
 			memmove(self->ob_item + (cur - i) * itemsize,
 				self->ob_item + (cur + 1) * itemsize,
 				lim * itemsize);
 		}
 		cur = start + slicelength * step;
-		if (cur < Py_SIZE(self)) {
+		if (cur < (size_t)Py_SIZE(self)) {
 			memmove(self->ob_item + (cur-slicelength) * itemsize,
 				self->ob_item + cur * itemsize,
 				(Py_SIZE(self) - cur) * itemsize);