diff --git a/libluna/include/luna/Result.h b/libluna/include/luna/Result.h
index 00c88feb..e584f877 100644
--- a/libluna/include/luna/Result.h
+++ b/libluna/include/luna/Result.h
@@ -201,7 +201,7 @@ template <> class Result<void>
 
     static Result<void> from_syscall(long rc)
     {
-        if (rc < 0) return Error { -rc };
+        if (rc < 0) return Error { (int)-rc };
 
         return {};
     }