diff --git a/wordfreq_builder/rules.ninja b/wordfreq_builder/rules.ninja
index f06e5f2..e4d95e0 100644
--- a/wordfreq_builder/rules.ninja
+++ b/wordfreq_builder/rules.ninja
@@ -76,7 +76,7 @@ rule count
   command = python -m wordfreq_builder.cli.count_tokens $in $out
 
 rule merge
-  command = python -m wordfreq_builder.cli.combine_lists -o $out -c $cutoff $in
+  command = python -m wordfreq_builder.cli.merge_freqs -o $out -c $cutoff $in
 
 rule merge_counts
   command = python -m wordfreq_builder.cli.merge_counts -o $out $in