diff --git a/tools/ratbagctl.test.in b/tools/ratbagctl.test.in
index 7cb918bf..cbd7cca6 100755
--- a/tools/ratbagctl.test.in
+++ b/tools/ratbagctl.test.in
@@ -642,6 +642,7 @@ def parse(input_string):
 
 def main(argv):
     os.environ['RATBAG_TEST'] = '1'
+    os.environ['LIBRATBAG_DATA_DIR'] = '@LIBRATBAG_DATA_DIR@'
     resource.setrlimit(resource.RLIMIT_CORE, (0, 0))
 
     args = parse(argv)