diff --git a/test/bash-preexec.bats b/test/bash-preexec.bats
index 3d3f6b7..0d970f6 100644
--- a/test/bash-preexec.bats
+++ b/test/bash-preexec.bats
@@ -79,7 +79,7 @@ set_exit_code_and_run_precmd() {
 
   eval_PROMPT_COMMAND
 
-  [[ "$PROMPT_COMMAND" != *"trap DEBUG"* ]] || return 1
+  [[ "$PROMPT_COMMAND" != *"trap - DEBUG"* ]] || return 1
   [[ "$PROMPT_COMMAND" != *"__bp_install"* ]] || return 1
 }