diff --git a/pkgs/development/interpreters/python/hooks/pytest-check-hook.sh b/pkgs/development/interpreters/python/hooks/pytest-check-hook.sh
index ab4381b0e272..84643a3b50ca 100644
--- a/pkgs/development/interpreters/python/hooks/pytest-check-hook.sh
+++ b/pkgs/development/interpreters/python/hooks/pytest-check-hook.sh
@@ -38,7 +38,8 @@ function pytestCheckPhase() {
         else
             # The `|| kill "$$"` trick propagates the errors from the process substitutiton subshell,
             # which is suggested by a StackOverflow answer: https://unix.stackexchange.com/a/217643
-            readarray -t -O"${#flagsArray[@]}" flagsArray < <(@pythonCheckInterpreter@ - "$path" <<EOF || kill "$$"
+            readarray -t -O"${#flagsArray[@]}" flagsArray < <(
+                @pythonCheckInterpreter@ - "$path" <<EOF || kill "$$"
 import glob
 import sys
 path_glob=sys.argv[1]