diff --git a/fish-rust/src/common.rs b/fish-rust/src/common.rs
index 3ad25510e..d102ac41f 100644
--- a/fish-rust/src/common.rs
+++ b/fish-rust/src/common.rs
@@ -1467,10 +1467,10 @@ pub fn fish_setlocale() {
 
 /// Test if the character can be encoded using the current locale.
 fn can_be_encoded(wc: char) -> bool {
-    let mut converted = [0_i8; AT_LEAST_MB_LEN_MAX];
+    let mut converted: [libc::c_char; AT_LEAST_MB_LEN_MAX] = [0; AT_LEAST_MB_LEN_MAX];
     let mut state = zero_mbstate();
     unsafe {
-        wcrtomb(&mut converted[0], wc as libc::wchar_t, &mut state) != 0_usize.wrapping_sub(1)
+        wcrtomb(converted.as_mut_ptr(), wc as libc::wchar_t, &mut state) != 0_usize.wrapping_sub(1)
     }
 }