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-rw-r--r--pkgs/development/interpreters/python/hooks/pip-build-hook.sh2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/interpreters/python/hooks/pip-build-hook.sh b/pkgs/development/interpreters/python/hooks/pip-build-hook.sh
index c297bfffb1e20..ac025165410ae 100644
--- a/pkgs/development/interpreters/python/hooks/pip-build-hook.sh
+++ b/pkgs/development/interpreters/python/hooks/pip-build-hook.sh
@@ -31,7 +31,7 @@ pipShellHook() {
     echo "Finished executing pipShellHook"
 }
 
-if [ -z "$dontUsePipBuild" ] && [ -z "$buildPhase" ]; then
+if [ -z "${dontUsePipBuild-}" ] && [ -z "$buildPhase" ]; then
     echo "Using pipBuildPhase"
     buildPhase=pipBuildPhase
 fi