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-rw-r--r--nixpkgs/pkgs/development/interpreters/python/hooks/python-catch-conflicts-hook.sh2
1 files changed, 1 insertions, 1 deletions
diff --git a/nixpkgs/pkgs/development/interpreters/python/hooks/python-catch-conflicts-hook.sh b/nixpkgs/pkgs/development/interpreters/python/hooks/python-catch-conflicts-hook.sh
index e9065cf17934..374a2eddb407 100644
--- a/nixpkgs/pkgs/development/interpreters/python/hooks/python-catch-conflicts-hook.sh
+++ b/nixpkgs/pkgs/development/interpreters/python/hooks/python-catch-conflicts-hook.sh
@@ -5,6 +5,6 @@ pythonCatchConflictsPhase() {
     @pythonInterpreter@ @catchConflicts@
 }
 
-if [ -z "$dontUsePythonCatchConflicts" ]; then
+if [ -z "${dontUsePythonCatchConflicts-}" ]; then
     preDistPhases+=" pythonCatchConflictsPhase"
 fi