diff --git a/tesseract.json b/tesseract.json
index b1b56c985a..1ad1572986 100644
--- a/tesseract.json
+++ b/tesseract.json
@@ -18,6 +18,9 @@
         "unicharset_extractor.exe",
         "wordlist2dawg.exe"
     ],
+    "env_set": {
+        "TESSDATA_PREFIX": "$dir"
+    },
     "persist": [
         "tessdata"
     ],