diff --git a/pkgs/libspatialindex/default.nix b/pkgs/libspatialindex/default.nix
index 16c98abf..e1f93c82 100644
--- a/pkgs/libspatialindex/default.nix
+++ b/pkgs/libspatialindex/default.nix
@@ -23,7 +23,7 @@ stdenv.mkDerivation (finalAttrs: {
   nativeBuildInputs = [ cmake ];
 
   cmakeFlags = [
-    "-DSIDX_BUILD_TESTS=${if finalAttrs.doCheck then "ON" else "OFF"}"
+    "-DSIDX_BUILD_TESTS=${if finalAttrs.finalPackage.doCheck then "ON" else "OFF"}"
   ];
 
   doCheck = true;