diff --git a/compiler/rustc_data_structures/src/small_c_str.rs b/compiler/rustc_data_structures/src/small_c_str.rs
index cd9025245628..3a8ab8ff9911 100644
--- a/compiler/rustc_data_structures/src/small_c_str.rs
+++ b/compiler/rustc_data_structures/src/small_c_str.rs
@@ -62,6 +62,7 @@ impl SmallCStr {
 impl Deref for SmallCStr {
     type Target = ffi::CStr;
 
+    #[inline]
     fn deref(&self) -> &ffi::CStr {
         self.as_c_str()
     }