diff --git a/java_tools/configuration_definition/src/main/java/com/rusefi/IoUtil2.java b/java_tools/configuration_definition/src/main/java/com/rusefi/IoUtil2.java
index 696448463a..90721ba7b1 100644
--- a/java_tools/configuration_definition/src/main/java/com/rusefi/IoUtil2.java
+++ b/java_tools/configuration_definition/src/main/java/com/rusefi/IoUtil2.java
@@ -33,7 +33,7 @@ public class IoUtil2 {
     }
 
     private static long getCrc32(String fileName) throws IOException {
-        File file = new File(RootHolder.ROOT + fileName);
+        File file = new File(prependIfNotAbsolute(RootHolder.ROOT, fileName));
         byte[] fileContent = Files.readAllBytes(file.toPath());
         for (int i = 0; i < fileContent.length; i++) {
             byte aByte = fileContent[i];
@@ -45,6 +45,13 @@ public class IoUtil2 {
         return c.getValue();
     }
 
+    private static String prependIfNotAbsolute(String prefix, String fileName) {
+        if (new File(fileName).isAbsolute()) {
+            return fileName;
+        } else {
+            return prefix + fileName;
+        }
+    }
 
     static long getCrc32(List<String> inputFileNames) throws IOException {
         // get CRC32 of given input files