diff --git a/src/doompanning.cc b/src/doompanning.cc
index e3f7f88..451c713 100644
--- a/src/doompanning.cc
+++ b/src/doompanning.cc
@@ -162,7 +162,7 @@ void perform_actions(ControllerContext &ctx, const ControllerActions &actions)
 }
 
 inline auto dp_now() { return std::chrono::steady_clock::now(); }
-inline auto dp_elapsed(const std::chrono::steady_clock::time_point &tStart) { return tStart - dp_now(); }
+inline auto dp_elapsed(const std::chrono::steady_clock::time_point &tStart) { return dp_now() - tStart; }
 
 void check_on_dooms(ControllerContext &ctx)
 {