diff --git a/src/number-handler.js b/src/number-handler.js
index 7d0e7f9b..aac94aa0 100644
--- a/src/number-handler.js
+++ b/src/number-handler.js
@@ -88,6 +88,7 @@
   scope.addPropertiesHandler(parseNumber, mergeFlex, ['flex-grow', 'flex-shrink']);
   scope.addPropertiesHandler(parseNumber, mergePositiveIntegers, ['orphans', 'widows']);
   scope.addPropertiesHandler(parseNumber, round, ['z-index']);
+  scope.addPropertiesHandler(parseNumber, mergeNumbers, ['stroke-dashoffset']);
 
   scope.parseNumber = parseNumber;
   scope.parseNumberList = parseNumberList;
diff --git a/test/js/number-handler.js b/test/js/number-handler.js
index b4639e40..f69bb3c8 100644
--- a/test/js/number-handler.js
+++ b/test/js/number-handler.js
@@ -39,4 +39,7 @@ suite('number-handler', function() {
     assert.equal(interpolation(-1), '0');
     assert.equal(interpolation(2), '1');
   });
+  test('unitless stroke-dashoffset interpolation', function() {
+    assert.equal(webAnimations1.propertyInterpolation('strokeDashoffset', '10', '50')(0.25), '20');
+  });
 });