diff --git a/js/usercss.js b/js/usercss.js
index eb1a31dd..80315cdd 100644
--- a/js/usercss.js
+++ b/js/usercss.js
@@ -446,6 +446,9 @@ var usercss = (function () {
         parseStringToEnd(state);
         usercssData[state.key] = state.value;
       }
+      if (state.key === 'version') {
+        usercssData[state.key] = normalizeVersion(usercssData[state.key]);
+      }
       if (METAS[state.key]) {
         style[state.key] = usercssData[state.key];
       }
@@ -460,6 +463,14 @@ var usercss = (function () {
     return style;
   }
 
+  function normalizeVersion(version) {
+    // https://docs.npmjs.com/misc/semver#versions
+    if (version[0] === 'v' || version[0] === '=') {
+      return version.slice(1);
+    }
+    return version;
+  }
+
   function buildCode(style) {
     const {usercssData: {preprocessor, vars}, sourceCode} = style;
     let builder;