1 files changed, 1 insertions, 1 deletions
diff --git a/src/main/java/com/google/devtools/build/lib/rules/python/PythonUtils.java b/src/main/java/com/google/devtools/build/lib/rules/python/PythonUtils.java
index 824fef7b03..fe2133f91b 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/python/PythonUtils.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/python/PythonUtils.java
@@ -125,7 +125,7 @@ public final class PythonUtils {
             .setExecutable(py2to3converter)
             .setProgressMessage("Converting to Python 3: %s", input.prettyPrint())
             .setMnemonic("2to3")
-            .setCommandLine(commandLine.build())
+            .addCommandLine(commandLine.build())
             .build(ruleContext));
     return output;
   }