diff --git a/extensions/undertow/runtime/src/main/java/io/quarkus/undertow/runtime/KnownPathResourceManager.java b/extensions/undertow/runtime/src/main/java/io/quarkus/undertow/runtime/KnownPathResourceManager.java
index ee6069a65fdab..0e665ab14a577 100644
--- a/extensions/undertow/runtime/src/main/java/io/quarkus/undertow/runtime/KnownPathResourceManager.java
+++ b/extensions/undertow/runtime/src/main/java/io/quarkus/undertow/runtime/KnownPathResourceManager.java
@@ -86,7 +86,7 @@ private DirectoryResource(String path) {
         }
 
         private String evaluatePath(String path) {
-            return IS_WINDOWS ? path.replaceAll("\\\\", "/") : path;
+            return path.replaceAll("\\\\", "/");
         }
 
         @Override