diff --git a/libc/include/CMakeLists.txt b/libc/include/CMakeLists.txt
index 4c52a7615c91d7..d11dd464c10b15 100644
--- a/libc/include/CMakeLists.txt
+++ b/libc/include/CMakeLists.txt
@@ -119,6 +119,7 @@ add_gen_header(
   DEF_FILE unistd.h.def
   GEN_HDR unistd.h
   DEPENDS
+    .libc_posix_types
     .llvm_libc_common_h
 )