diff --git a/testsuite/tests/test/183-formal_params/test.yaml b/testsuite/tests/test/183-formal_params/test.yaml
index 6665c4a3..27de933c 100644
--- a/testsuite/tests/test/183-formal_params/test.yaml
+++ b/testsuite/tests/test/183-formal_params/test.yaml
@@ -3,5 +3,7 @@ description: Test that gnattest does not attempt to generate test inputs for
 
 driver: shell_script
 
+canonicalize_backslashes: True
+
 control:
     - [XFAIL, 'x86', 'Marshalling not working for 32bits (UB03-008)']