diff --git a/src/Thresholds.cpp b/src/Thresholds.cpp
index aa73063..5f56ae2 100644
--- a/src/Thresholds.cpp
+++ b/src/Thresholds.cpp
@@ -348,7 +348,7 @@
     pair->first.level = threshold.level;
     pair->first.direction = threshold.direction;
     pair->first.assert = assert;
-    pair->second.expires_from_now(std::chrono::seconds(waitTime));
+    pair->second.expires_after(std::chrono::seconds(waitTime));
     pair->second.async_wait([weakSensor, pair, threshold, assert,
                              assertValue](boost::system::error_code ec) {
         auto sensorPtr = weakSensor.lock();