diff --git a/test/src/comp-tests.el b/test/src/comp-tests.el
index 6d714656ade..2e388b9f148 100644
--- a/test/src/comp-tests.el
+++ b/test/src/comp-tests.el
@@ -30,6 +30,7 @@
 (require 'comp)
 
 (setq comp-speed 3)
+(setq comp-debug 1)
 
 (defconst comp-test-src
   (concat (file-name-directory (or load-file-name buffer-file-name))