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-rw-r--r--pkgs/development/compilers/zulu/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/compilers/zulu/default.nix b/pkgs/development/compilers/zulu/default.nix
index 5f345c87355f..5fe2473bac6d 100644
--- a/pkgs/development/compilers/zulu/default.nix
+++ b/pkgs/development/compilers/zulu/default.nix
@@ -55,7 +55,7 @@ in stdenv.mkDerivation {
 
     # Set JAVA_HOME automatically.
     cat <<EOF >> $out/nix-support/setup-hook
-    if [ -z "\$JAVA_HOME" ]; then export JAVA_HOME=$out; fi
+    if [ -z "\''${JAVA_HOME-}" ]; then export JAVA_HOME=$out; fi
     EOF
   '';