1 files changed, 4 insertions, 2 deletions

diff --git a/lib/rfs.js b/lib/rfs.js
index 7ffb235..850c93f 100644
--- a/lib/rfs.js
+++ b/lib/rfs.js
@@ -81,7 +81,9 @@ module.exports = class {
         return;
       }
 
-      node.nodes.filter(node => node.type === 'word').forEach(node => {
+      const wordNodes = node.nodes.filter(node => node.type === 'word');
+
+      for (const node of wordNodes) {
         node.value = node.value.replace(/^(-?\d*\.?\d+)(.*)/g, (match, value, unit) => {
           value = Number.parseFloat(value);
 
@@ -116,7 +118,7 @@ module.exports = class {
 
           return `calc(-${this.toFixed(baseValue, this.opts.unitPrecision)}${this.opts.unit} - ${this.toFixed(diff * 100 / this.opts.breakpoint, this.opts.unitPrecision)}${viewportUnit})`;
         });
-      });
+      }
 
       // Now we will transform the existing rgba() function node
       // into a word node with the hex value