diff --git a/js/js.translator/src/org/jetbrains/k2js/config/EcmaVersion.java b/js/js.translator/src/org/jetbrains/k2js/config/EcmaVersion.java
index ffc346459ba..9b64df99f47 100644
--- a/js/js.translator/src/org/jetbrains/k2js/config/EcmaVersion.java
+++ b/js/js.translator/src/org/jetbrains/k2js/config/EcmaVersion.java
@@ -30,7 +30,7 @@ public enum EcmaVersion {
 
     @NotNull
     public static EcmaVersion fromString(@Nullable String target) {
-        return StringUtil.compareVersionNumbers(target, "5") >= 0 ? v5 : v3;
+        return StringUtil.compareVersionNumbers(target, "v5") >= 0 ? v5 : v3;
     }
 
     @NotNull