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-rw-r--r--src/doc/guide-ffi.md2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/doc/guide-ffi.md b/src/doc/guide-ffi.md
index 14e60b5ba08..ee398334e2a 100644
--- a/src/doc/guide-ffi.md
+++ b/src/doc/guide-ffi.md
@@ -298,7 +298,7 @@ fn main() {
 C code:
 
 ~~~~c
-typedef void (*rust_callback)(int32_t);
+typedef void (*rust_callback)(void*, int32_t);
 void* cb_target;
 rust_callback cb;