diff --git a/skimage/filter/rank/percentile_cy.pyx b/skimage/filter/rank/percentile_cy.pyx
index 31afd53a..ffa5e1b0 100644
--- a/skimage/filter/rank/percentile_cy.pyx
+++ b/skimage/filter/rank/percentile_cy.pyx
@@ -268,7 +268,8 @@ def _percentile(dtype_t[:, ::1] image,
                 char[:, ::1] selem,
                 char[:, ::1] mask,
                 dtype_t_out[:, ::1] out,
-                char shift_x, char shift_y, double p0, Py_ssize_t max_bin):
+                char shift_x, char shift_y, double p0, double p1,
+                Py_ssize_t max_bin):
 
     _core(_kernel_percentile[dtype_t], image, selem, mask, out,
           shift_x, shift_y, p0, 1, 0, 0, max_bin)
@@ -289,7 +290,8 @@ def _threshold(dtype_t[:, ::1] image,
                char[:, ::1] selem,
                char[:, ::1] mask,
                dtype_t_out[:, ::1] out,
-               char shift_x, char shift_y, double p0, Py_ssize_t max_bin):
+               char shift_x, char shift_y, double p0, double p1,
+               Py_ssize_t max_bin):
 
     _core(_kernel_threshold[dtype_t], image, selem, mask, out,
           shift_x, shift_y, p0, 1, 0, 0, max_bin)