diff --git a/src/header/stdio/cbindgen.toml b/src/header/stdio/cbindgen.toml
index 540f3775b6..dd80d4e7b9 100644
--- a/src/header/stdio/cbindgen.toml
+++ b/src/header/stdio/cbindgen.toml
@@ -1,11 +1,12 @@
 sys_includes = ["stdarg.h", "stddef.h", "stdint.h", "sys/types.h", "features.h"]
 include_guard = "_RELIBC_STDIO_H"
 trailer = """
+#ifndef _RELIBC_BITS_STDIO_H
+#define _RELIBC_BITS_STDIO_H
+
 // XXX: this is only here because cbindgen can't handle string constants
 #define P_tmpdir "/tmp"
 
-typedef struct FILE FILE;
-
 // A typedef doesn't suffice, because libgmp uses this definition to check if
 // STDIO was loaded.
 #define FILE FILE
@@ -13,6 +14,8 @@ typedef struct FILE FILE;
 #define stdin stdin
 #define stdout stdout
 #define stderr stderr
+
+#endif // _RELIBC_BITS_STDIO_H
 """
 language = "C"
 style = "Type"
diff --git a/src/header/stdio/constants.rs b/src/header/stdio/constants.rs
index d8caa0ca34..ff19da78e2 100644
--- a/src/header/stdio/constants.rs
+++ b/src/header/stdio/constants.rs
@@ -43,6 +43,7 @@ pub const L_tmpnam: c_int = 7;
 pub const TMP_MAX: int32_t = 2_147_483_647;
 // XXX: defined manually in cbindgen as well because it can't handle
 //      string constants in any form AFAICT
+/// cbindgen:ignore
 pub const P_tmpdir: &[u8; 5] = b"/tmp\0";
 
 #[allow(non_camel_case_types)]