diff --git a/skimage/filters/rank/bilateral_cy.pyx b/skimage/filters/rank/bilateral_cy.pyx
index 3acc26a4..a008e682 100644
--- a/skimage/filters/rank/bilateral_cy.pyx
+++ b/skimage/filters/rank/bilateral_cy.pyx
@@ -26,7 +26,7 @@ cdef inline void _kernel_mean(dtype_t_out* out, Py_ssize_t odepth,
                 bilat_pop += histo[i]
                 mean += histo[i] * i
         if bilat_pop:
-            out[0] = <dtype_t_out>mean / bilat_pop
+            out[0] = <dtype_t_out>(mean / bilat_pop)
         else:
             out[0] = <dtype_t_out>0
     else:
diff --git a/skimage/filters/rank/generic_cy.pyx b/skimage/filters/rank/generic_cy.pyx
index a5c70bf4..3b28005a 100644
--- a/skimage/filters/rank/generic_cy.pyx
+++ b/skimage/filters/rank/generic_cy.pyx
@@ -29,7 +29,7 @@ cdef inline void _kernel_autolevel(dtype_t_out* out, Py_ssize_t odepth,
                 break
         delta = imax - imin
         if delta > 0:
-            out[0] = <dtype_t_out>(max_bin - 1) * (g - imin) / delta
+            out[0] = <dtype_t_out>((max_bin - 1) * (g - imin) / delta)
         else:
             out[0] = <dtype_t_out>0
     else:
@@ -49,7 +49,7 @@ cdef inline void _kernel_bottomhat(dtype_t_out* out, Py_ssize_t odepth,
         for i in range(max_bin):
             if histo[i]:
                 break
-        out[0] = <dtype_t_out>g - i
+        out[0] = <dtype_t_out>(g - i)
     else:
         out[0] = <dtype_t_out>0
 
diff --git a/skimage/filters/rank/percentile_cy.pyx b/skimage/filters/rank/percentile_cy.pyx
index 3be4b52a..4d90555f 100644
--- a/skimage/filters/rank/percentile_cy.pyx
+++ b/skimage/filters/rank/percentile_cy.pyx
@@ -116,7 +116,7 @@ cdef inline void _kernel_sum(dtype_t_out* out, Py_ssize_t odepth,
                 sum_g += histo[i] * i
 
         if n > 0:
-            out[0] = <dtype_t_out>(sum_g)
+            out[0] = <dtype_t_out>sum_g
         else:
             out[0] = <dtype_t_out>0
     else: