diff --git a/libc/upstream-netbsd/android/include/resolv_mt.h b/libc/upstream-netbsd/android/include/resolv_mt.h
new file mode 100644
index 0000000..664ae93
--- /dev/null
+++ b/libc/upstream-netbsd/android/include/resolv_mt.h
@@ -0,0 +1,4 @@
+#pragma once
+
+// Android never enabled the per-thread code, so this was always static like glibc.
+static char inet_nsap_ntoa_tmpbuf[255*3];