diff --git a/plugins/cleanupListOfValues.js b/plugins/cleanupListOfValues.js
index 55ccb0959..e75944da0 100644
--- a/plugins/cleanupListOfValues.js
+++ b/plugins/cleanupListOfValues.js
@@ -18,7 +18,7 @@ var regNumericValues = /^([\-+]?\d*\.?\d+([eE][\-+]?\d+)?)(px|pt|pc|mm|cm|m|in|f
     removeLeadingZero = require('../lib/svgo/tools').removeLeadingZero,
     absoluteLengths = { // relative to px
         cm: 96/2.54,
-        mm: 9600/2.54,
+        mm: 96/25.4,
         in: 96,
         pt: 4/3,
         pc: 16
diff --git a/plugins/cleanupNumericValues.js b/plugins/cleanupNumericValues.js
index 8af7e72be..487443a5c 100644
--- a/plugins/cleanupNumericValues.js
+++ b/plugins/cleanupNumericValues.js
@@ -17,7 +17,7 @@ var regNumericValues = /^([\-+]?\d*\.?\d+([eE][\-+]?\d+)?)(px|pt|pc|mm|cm|m|in|f
     removeLeadingZero = require('../lib/svgo/tools').removeLeadingZero,
     absoluteLengths = { // relative to px
         cm: 96/2.54,
-        mm: 9600/2.54,
+        mm: 96/25.4,
         in: 96,
         pt: 4/3,
         pc: 16