diff --git a/hadoop/src/main/java/water/hadoop/h2omapper.java b/hadoop/src/main/java/water/hadoop/h2omapper.java
index 0173368a15..df3f4ba160 100644
--- a/hadoop/src/main/java/water/hadoop/h2omapper.java
+++ b/hadoop/src/main/java/water/hadoop/h2omapper.java
@@ -409,7 +409,7 @@ private int run2(Context context) throws IOException, InterruptedException {
     }
     if (dataMaxFactorLevelsString != null) {
       if (dataMaxFactorLevelsString.length() > 0) {
-        argsList.add("-max_data_factor_levels");
+        argsList.add("-data_max_factor_levels");
         int dataMaxFactorLevels = Integer.parseInt(dataMaxFactorLevelsString);
         argsList.add(Integer.toString(dataMaxFactorLevels));
       }