diff --git a/lib/brakeman/checks/check_sql.rb b/lib/brakeman/checks/check_sql.rb
index f96c90749d6daa826f81f2b435198a56479d0abf..838a7d535e26881eb5be041fc09d3e45ed4cf285 100644
--- a/lib/brakeman/checks/check_sql.rb
+++ b/lib/brakeman/checks/check_sql.rb
@@ -153,6 +153,7 @@ class Brakeman::CheckSQL < Brakeman::BaseCheck
   #   :find,
   #   s(:arglist, s(:str, "something")))
   def constantize_call? result
-    sexp? result[-1][1] and result[-1][1][0] == :call and result[-1][1][2] == :constantize
+    call = result[:call]
+    call? call[1] and call[1][2] == :constantize
   end
 end