diff --git a/nix/tools/tests.nix b/nix/tools/tests.nix
index 4606b1670a..92769e17e5 100644
--- a/nix/tools/tests.nix
+++ b/nix/tools/tests.nix
@@ -91,16 +91,15 @@ let
     checkedShellScript
       {
         name = "postgrest-dump-schema";
-        docs = "Dump the loaded schema's SchemaCache as a yaml file.";
+        docs = "Dump the loaded schema's SchemaCache in JSON format.";
         workingDir = "/";
         withEnv = postgrest.env;
         withPath = [ jq ];
       }
       ''
-        ${withTools.withPg} -f test/spec/fixtures.sql \
+        ${withTools.withPg} -f test/spec/fixtures/load.sql \
             ${cabal-install}/bin/cabal v2-run ${devCabalOptions} --verbose=0 -- \
-            postgrest --dump-schema \
-            | ${yq}/bin/yq -y .
+            postgrest --dump-schema
       '';
 
   coverage =