1 files changed, 2 insertions, 2 deletions
diff --git a/nixpkgs/pkgs/development/tools/build-managers/apache-ant/default.nix b/nixpkgs/pkgs/development/tools/build-managers/apache-ant/default.nix
index 8d1e09eeb338..28e86e291755 100644
--- a/nixpkgs/pkgs/development/tools/build-managers/apache-ant/default.nix
+++ b/nixpkgs/pkgs/development/tools/build-managers/apache-ant/default.nix
@@ -46,14 +46,14 @@ stdenv.mkDerivation {
       # JRE by looking for java.  The latter allows just the JRE to be
       # used with (say) ECJ as the compiler.  Finally, allow the GNU
       # JVM.
-      if [ -z "\$JAVA_HOME" ]; then
+      if [ -z "\''${JAVA_HOME-}" ]; then
           for i in javac java gij; do
               if p="\$(type -p \$i)"; then
                   export JAVA_HOME="\$(${coreutils}/bin/dirname \$(${coreutils}/bin/dirname \$(${coreutils}/bin/readlink -f \$p)))"
                   break
               fi
           done
-          if [ -z "\$JAVA_HOME" ]; then
+          if [ -z "\''${JAVA_HOME-}" ]; then
               echo "\$0: cannot find the JDK or JRE" >&2
               exit 1
           fi