diff --git a/skimage/draw/_draw.pyx b/skimage/draw/_draw.pyx
index 28103304..50342c91 100644
--- a/skimage/draw/_draw.pyx
+++ b/skimage/draw/_draw.pyx
@@ -29,7 +29,7 @@ def line(ssize_t y, ssize_t x, ssize_t y2, ssize_t x2):
 
     """
 
-    cdef np.ndarray[ssize_t, ndim=1, mode="c"] rr, cc
+    cdef np.ndarray[np.intp_t, ndim=1, mode="c"] rr, cc
 
     cdef char steep = 0
     cdef ssize_t dx = abs(x2 - x)
diff --git a/skimage/morphology/_convex_hull.pyx b/skimage/morphology/_convex_hull.pyx
index 6c9d1083..6746fa9f 100644
--- a/skimage/morphology/_convex_hull.pyx
+++ b/skimage/morphology/_convex_hull.pyx
@@ -26,7 +26,7 @@ def possible_hull(np.ndarray[dtype=np.uint8_t, ndim=2, mode="c"] img):
     #         cols storage slots for top boundary pixels
     #         rows storage slots for right boundary pixels
     #         cols storage slots for bottom boundary pixels
-    cdef np.ndarray[dtype=ssize_t, ndim=2] nonzero = \
+    cdef np.ndarray[dtype=np.intp_t, ndim=2] nonzero = \
          np.ones((2 * (rows + cols), 2), dtype=np.int)
     nonzero *= -1