diff --git a/libc/arch-x86/x86.mk b/libc/arch-x86/x86.mk
index 0f22169..3dc71d1 100644
--- a/libc/arch-x86/x86.mk
+++ b/libc/arch-x86/x86.mk
@@ -5,6 +5,7 @@
     bionic/legacy_32_bit_support.cpp \
     bionic/ndk_cruft.cpp \
     bionic/time64.c \
+    upstream-openbsd/lib/libc/stdio/putw.c \
 
 # Fortify implementations of libc functions.
 libc_common_src_files_x86 += \