diff --git a/tests/functional/dyn-drv/non-trivial.nix b/tests/functional/dyn-drv/non-trivial.nix
index 1b7c1ed1895..3b99a4a84ed 100644
--- a/tests/functional/dyn-drv/non-trivial.nix
+++ b/tests/functional/dyn-drv/non-trivial.nix
@@ -23,7 +23,7 @@ builtins.outputOf (mkDerivation {
 
     # Cannot just literally include this, or Nix will think it is the
     # *outer* derivation that's trying to refer to itself, and
-    # substitute the string too son.
+    # substitute the string too soon.
     placeholder=$(nix eval --raw --expr 'builtins.placeholder "out"')
 
     declare -A drvs=()