diff --git a/skimage/_shared/interpolation.pxd b/skimage/_shared/interpolation.pxd
index ef880109..f43ff25e 100644
--- a/skimage/_shared/interpolation.pxd
+++ b/skimage/_shared/interpolation.pxd
@@ -1,24 +1,24 @@
 
-cdef inline double nearest_neighbour_interpolation(double* image, int rows,
-                                                   int cols, double r,
-                                                   double c, char mode,
-                                                   double cval)
+cdef double nearest_neighbour_interpolation(double* image, int rows,
+                                            int cols, double r,
+                                            double c, char mode,
+                                            double cval)
 
-cdef inline double bilinear_interpolation(double* image, int rows, int cols,
-                                          double r, double c, char mode,
-                                          double cval)
+cdef double bilinear_interpolation(double* image, int rows, int cols,
+                                   double r, double c, char mode,
+                                   double cval)
 
-cdef inline double quadratic_interpolation(double x, double[3] f)
-cdef inline double biquadratic_interpolation(double* image, int rows, int cols,
-                                             double r, double c, char mode,
-                                             double cval)
+cdef double quadratic_interpolation(double x, double[3] f)
+cdef double biquadratic_interpolation(double* image, int rows, int cols,
+                                      double r, double c, char mode,
+                                      double cval)
 
-cdef inline double cubic_interpolation(double x, double[4] f)
-cdef inline double bicubic_interpolation(double* image, int rows, int cols,
-                                         double r, double c, char mode,
-                                         double cval)
+cdef double cubic_interpolation(double x, double[4] f)
+cdef double bicubic_interpolation(double* image, int rows, int cols,
+                                  double r, double c, char mode,
+                                  double cval)
 
-cdef inline double get_pixel(double* image, int rows, int cols, int r, int c,
-                             char mode, double cval)
+cdef double get_pixel(double* image, int rows, int cols, int r, int c,
+                      char mode, double cval)
 
-cdef inline int coord_map(int dim, int coord, char mode)
+cdef int coord_map(int dim, int coord, char mode)