diff --git a/wasmtime-wasi/build.rs b/wasmtime-wasi/build.rs
index fa9d79f17f..1ed59201b4 100644
--- a/wasmtime-wasi/build.rs
+++ b/wasmtime-wasi/build.rs
@@ -103,7 +103,8 @@ fn main() {
         .blacklist_item("__WASI_ETIMEDOUT")
         .blacklist_item("__WASI_ETXTBSY")
         .blacklist_item("__WASI_EXDEV")
-        .blacklist_item("__WASI_ENOTCAPABLE");
+        .blacklist_item("__WASI_ENOTCAPABLE")
+        .blacklist_item("__WASI_PREOPENTYPE_DIR");
 
     let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
 
diff --git a/wasmtime-wasi/src/host.rs b/wasmtime-wasi/src/host.rs
index 1b83c5491e..afd01bc163 100644
--- a/wasmtime-wasi/src/host.rs
+++ b/wasmtime-wasi/src/host.rs
@@ -83,3 +83,6 @@ pub const __WASI_ETIMEDOUT: __wasi_errno_t = 73;
 pub const __WASI_ETXTBSY: __wasi_errno_t = 74;
 pub const __WASI_EXDEV: __wasi_errno_t = 75;
 pub const __WASI_ENOTCAPABLE: __wasi_errno_t = 76;
+
+// pub type __wasi_preopentype_t = u8;
+pub const __WASI_PREOPENTYPE_DIR: __wasi_preopentype_t = 0;
diff --git a/wasmtime-wasi/src/host_impls.rs b/wasmtime-wasi/src/host_impls.rs
index d614d6d0b1..eb0bae29e0 100644
--- a/wasmtime-wasi/src/host_impls.rs
+++ b/wasmtime-wasi/src/host_impls.rs
@@ -133,7 +133,7 @@ pub fn wasmtime_ssp_fd_prestat_get(
     rwlock_rdlock!(prestats);
 
     let ret_code = if let Some(prestat) = fd_prestats_get_entry(prestats, fd) {
-        (*buf).pr_type = host::__WASI_PREOPENTYPE_DIR as host::__wasi_preopentype_t;
+        (*buf).pr_type = host::__WASI_PREOPENTYPE_DIR;
         unsafe {
             let dir_name = ::std::ffi::CStr::from_ptr((*prestat).dir).to_str().unwrap();
             (*buf).u.dir.pr_name_len = dir_name.len();