diff --git a/package.yaml b/package.yaml
index c704fbee4..b0f3889c3 100644
--- a/package.yaml
+++ b/package.yaml
@@ -242,7 +242,7 @@ when:
         - -fprof-auto
     else:
       ghc-options:
-        - -O
+        - -O -fllvm
 
 # The library contains all of our application code. The executable
 # defined below is just a thin wrapper.