diff --git a/unpacked/extensions/Safe.js b/unpacked/extensions/Safe.js
index 2aacba134..ef1dd7767 100644
--- a/unpacked/extensions/Safe.js
+++ b/unpacked/extensions/Safe.js
@@ -241,7 +241,7 @@
       px: 1/16,       // assume 1em = 16px
       mm: 96/25.4/16, // 25.4mm = 96px
       cm: 96/2.54/16, // 2.54cm = 96px
-      in: 96/16,      // 1in = 96px
+      'in': 96/16,      // 1in = 96px
       pt: 96/72/16,   // 72pt = 1in
       pc: 96/6/16     // 1pc = 12pt
     },