diff --git a/src/unix/notbsd/linux/musl.rs b/src/unix/notbsd/linux/musl.rs
index 7a244e49c4230..b11d850edc66c 100644
--- a/src/unix/notbsd/linux/musl.rs
+++ b/src/unix/notbsd/linux/musl.rs
@@ -6,6 +6,9 @@ pub type suseconds_t = i64;
 pub type ino_t = u64;
 pub type off_t = i64;
 pub type blkcnt_t = i64;
+#[cfg(target_arch = "arm")]
+pub type c_char = u8;
+#[cfg(not(target_arch = "arm"))]
 pub type c_char = i8;
 pub type wchar_t = i32;
 pub type nlink_t = u64;