diff --git a/src/attributes.rs b/src/attributes.rs
index 0fda9e7ae50..6195de912d2 100644
--- a/src/attributes.rs
+++ b/src/attributes.rs
@@ -121,6 +121,9 @@ pub fn from_fn_attrs<'gcc, 'tcx>(
         if codegen_fn_attrs.flags.contains(CodegenFnAttrFlags::FFI_RETURNS_TWICE) {
             func.add_attribute(FnAttribute::ReturnsTwice);
         }
+        if codegen_fn_attrs.flags.contains(CodegenFnAttrFlags::FFI_PURE) {
+            func.add_attribute(FnAttribute::Pure);
+        }
     }
 
     let function_features =