diff --git a/soong.bash b/soong.bash
index d88ebbfcd..f695e626d 100755
--- a/soong.bash
+++ b/soong.bash
@@ -40,4 +40,4 @@ if [ -f "${ENVFILE}" ]; then
     fi
 fi
 
-"prebuilts/ninja/${PREBUILTOS}/ninja" -f "${BUILDDIR}/build.ninja" "$@"
+"prebuilts/ninja/${PREBUILTOS}/ninja" -f "${BUILDDIR}/build.ninja" -w dupbuild=err "$@"