diff --git a/fcntl/cbindgen.toml b/fcntl/cbindgen.toml
index 4193206804..948863cda4 100644
--- a/fcntl/cbindgen.toml
+++ b/fcntl/cbindgen.toml
@@ -1,3 +1,4 @@
+sys_includes = ["sys/types.h"]
 include_guard = "_FCNTL_H"
 language = "C"
 
diff --git a/unistd/cbindgen.toml b/unistd/cbindgen.toml
index 32fdb82257..259e4fadf2 100644
--- a/unistd/cbindgen.toml
+++ b/unistd/cbindgen.toml
@@ -1,3 +1,4 @@
+sys_includes = ["stdint.h", "sys/types.h"]
 include_guard = "_UNISTD_H"
 language = "C"