diff --git a/src/wasi/mod.rs b/src/wasi/mod.rs
index 2e4a6bded49d2..8fd1b2bed8c99 100644
--- a/src/wasi/mod.rs
+++ b/src/wasi/mod.rs
@@ -14,7 +14,7 @@ pub type ssize_t = isize;
 pub type ptrdiff_t = isize;
 pub type intptr_t = isize;
 pub type uintptr_t = usize;
-pub type off_t = i64;
+pub type off_t = c_longlong;
 pub type pid_t = i32;
 pub type clock_t = c_longlong;
 pub type time_t = c_longlong;