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-rw-r--r--doc/tutorial-ffi.md2
1 files changed, 1 insertions, 1 deletions
diff --git a/doc/tutorial-ffi.md b/doc/tutorial-ffi.md
index 371e0e2f3e4..c4fea5e48c9 100644
--- a/doc/tutorial-ffi.md
+++ b/doc/tutorial-ffi.md
@@ -303,7 +303,7 @@ conventions. Rust provides a way to tell the compiler which convention to use:
 #[cfg(target_os = "win32", target_arch = "x86")]
 #[link_name = "kernel32"]
 extern "stdcall" {
-    fn SetEnvironmentVariableA(n: *u8, v: *u8) -> int;
+    fn SetEnvironmentVariableA(n: *u8, v: *u8) -> std::libc::c_int;
 }
 ~~~~