diff --git a/packages/math/matrix.js b/packages/math/matrix.js
index b0489bf..c38ff1c 100644
--- a/packages/math/matrix.js
+++ b/packages/math/matrix.js
@@ -4,9 +4,9 @@
 // matrix is implemented as an n-element array. Data is stored in row-major
 // order.
 
-export copy = (matrix) => matrix.map((row) => [...row])
+export const copy = (matrix) => matrix.map((row) => [...row])
 
-export equals = (l, r) ->
+export const equals = (l, r) =>
 
   return false unless l.length is r.length
   return true if l.length is 0
@@ -20,12 +20,12 @@ export equals = (l, r) ->
 
   return true
 
-export size = (matrix) ->
+export const size = (matrix) =>
 
   return 0 if 0 is matrix.length
   return matrix.length * matrix[0].length
 
-export sizeVector = (matrix) ->
+export const sizeVector = (matrix) =>
 
   return [0, 0] if 0 is matrix.length
   return [matrix[0].length, matrix.length]