diff --git a/src/tokenTypes.js b/src/tokenTypes.js
index 30e8850..8e035ef 100644
--- a/src/tokenTypes.js
+++ b/src/tokenTypes.js
@@ -34,7 +34,7 @@ const identRe = /(^-?[_a-z][_a-z0-9-]*$)/i
 const numberRe = /^([+-]?(?:\d*\.)?\d+(?:[Ee][+-]?\d+)?)$/
 // Note lengthRe is sneaky: you can omit units for 0
 const lengthRe = /^(0$|(?:[+-]?(?:\d*\.)?\d+(?:[Ee][+-]?\d+)?)(?=px$))/
-const unsupportedUnitRe = /^([+-]?(?:\d*\.)?\d+(?:[Ee][+-]?\d+)?(ch|em|ex|rem|vh|vw|vmin|vmax|cm|mm|in|pc|pt))$/
+const unsupportedUnitRe = /^([+-]?(?:\d*\.)?\d+(?:[Ee][+-]?\d+)?(ch|em|ex|rem|vh|vw|vmin|vmax|cm|mm|in|pc|pt|pxdp|pxfz))$/
 const angleRe = /^([+-]?(?:\d*\.)?\d+(?:[Ee][+-]?\d+)?(?:deg|rad))$/
 const percentRe = /^([+-]?(?:\d*\.)?\d+(?:[Ee][+-]?\d+)?%)$/