diff --git a/CONTRIBUTORS.txt b/CONTRIBUTORS.txt
index d582ab63..38e2ea32 100644
--- a/CONTRIBUTORS.txt
+++ b/CONTRIBUTORS.txt
@@ -132,3 +132,6 @@
 
 - François Boulogne
   Andres Method for circle perimeter, ellipse perimeter drawing.
+
+- Thouis Jones
+  Vectorized operators for arrays of 16-bit ints.
diff --git a/skimage/filter/_histogram.h b/skimage/_shared/vectorized_ops.h
similarity index 90%
rename from skimage/filter/_histogram.h
rename to skimage/_shared/vectorized_ops.h
index 3df3a70d..e426c86e 100644
--- a/skimage/filter/_histogram.h
+++ b/skimage/_shared/vectorized_ops.h
@@ -1,13 +1,3 @@
-/*
- * Copyright (C) 2013 Thouis "Ray" Jones
- * Modified from code
- * Copyright (C) 2006  Simon Perreault
- *
- * Reference: S. Perreault and P. Hébert, "Median Filtering in Constant Time",
- * IEEE Transactions on Image Processing, September 2007.
- *
- */
-
 /* Intrinsic declarations */
 #if defined(__SSE2__)
 #include <emmintrin.h>
diff --git a/skimage/filter/_ctmf.pyx b/skimage/filter/_ctmf.pyx
index 87e4a8b9..75c1b47a 100644
--- a/skimage/filter/_ctmf.pyx
+++ b/skimage/filter/_ctmf.pyx
@@ -17,7 +17,7 @@ cimport cython
 from libc.stdlib cimport malloc, free
 from libc.string cimport memset
 
-cdef extern from "_histogram.h":
+cdef extern from "../_shared/vectorized_ops.h":
     void add16(np.uint16_t *dest, np.uint16_t *src)
     void sub16(np.uint16_t *dest, np.uint16_t *src)