diff --git a/default.nix b/default.nix
index 2c29c86..0b2fdd5 100644
--- a/default.nix
+++ b/default.nix
@@ -51,7 +51,7 @@ with rec
         ''
           repl() {
             shopt -s globstar
-            ghci -Wall app/NivTest.hs src/**/*.hs
+            ghci -clear-package-db -global-package-db -Wall app/NivTest.hs src/**/*.hs
           }
 
           echo "To start a REPL session, run:"