diff --git a/src/PostgREST/DbStructure.hs b/src/PostgREST/DbStructure.hs
index dc620ed1d..1c8738781 100644
--- a/src/PostgREST/DbStructure.hs
+++ b/src/PostgREST/DbStructure.hs
@@ -111,8 +111,8 @@ doesProcExist =
       FROM   pg_catalog.pg_namespace n
       JOIN   pg_catalog.pg_proc p
       ON     pronamespace = n.oid
-      WHERE  nspname = ?
-      AND    proname = ?
+      WHERE  nspname = $1
+      AND    proname = $2
     ) |]
 
 doesProcReturnJWT :: H.Query QualifiedIdentifier Bool
@@ -124,8 +124,8 @@ doesProcReturnJWT =
       FROM   pg_catalog.pg_namespace n
       JOIN   pg_catalog.pg_proc p
       ON     pronamespace = n.oid
-      WHERE  nspname = ?
-      AND    proname = ?
+      WHERE  nspname = $1
+      AND    proname = $2
       AND    pg_catalog.pg_get_function_result(p.oid) like '%jwt_claims'
     ) |]
 
diff --git a/src/PostgREST/QueryBuilder.hs b/src/PostgREST/QueryBuilder.hs
index 4eb7d2dee..8f1916c99 100644
--- a/src/PostgREST/QueryBuilder.hs
+++ b/src/PostgREST/QueryBuilder.hs
@@ -53,7 +53,7 @@ import           Data.Tree               (Tree(..))
 import qualified Data.Vector as V
 import           PostgREST.Types
 import qualified Data.Map as M
-import           Text.InterpolatedString.Perl6 (qc, q)
+import           Text.InterpolatedString.Perl6 (qc)
 import           Text.Regex.TDFA         ((=~))
 import qualified Data.ByteString.Char8   as BS
 import           Data.Scientific         ( FPFormat (..)
@@ -210,8 +210,8 @@ callProc :: QualifiedIdentifier -> JSON.Object -> H.Query () (Maybe JSON.Value)
 callProc qi params =
   H.statement sql HE.unit decodeObj True
   where
-    sql = [q| SELECT array_to_json(
-                coalesce(array_agg(row_to_json(t)), '{}')
+    sql = [qc| SELECT array_to_json(
+                coalesce(array_agg(row_to_json(t)), '\{}')
               )::character varying
               from ({_callSql}) t |]
     _args = intercalate "," $ map _assignment (HM.toList params)