diff --git a/bin/nix/idea.sh b/bin/nix/idea.sh
index c17ae33b3a8a..e423971932f8 100755
--- a/bin/nix/idea.sh
+++ b/bin/nix/idea.sh
@@ -59,7 +59,7 @@ if [ -z "$JDK" ]; then
   fi
 fi
 
-VERSION_LOG=`mktemp -t java.version.log.XXXX`
+VERSION_LOG=`mktemp -t java.version.log.XXXXXX`
 $JDK/bin/java -version 2> $VERSION_LOG
 grep 'OpenJDK' $VERSION_LOG
 OPEN_JDK=$?