diff --git a/src/librustc_codegen_llvm/llvm_util.rs b/src/librustc_codegen_llvm/llvm_util.rs
index fe21b19b52a3d..f1b8d532eeb76 100644
--- a/src/librustc_codegen_llvm/llvm_util.rs
+++ b/src/librustc_codegen_llvm/llvm_util.rs
@@ -145,6 +145,7 @@ const X86_WHITELIST: &[(&str, Option<&str>)] = &[
     ("bmi1", None),
     ("bmi2", None),
     ("cmpxchg16b", Some("cmpxchg16b_target_feature")),
+    ("f16c", Some("f16c_target_feature")),
     ("fma", None),
     ("fxsr", None),
     ("lzcnt", None),