diff --git a/control/zone.cpp b/control/zone.cpp
index 7c09727..82c3b70 100644
--- a/control/zone.cpp
+++ b/control/zone.cpp
@@ -289,10 +289,12 @@
                                   pred);
 
     // Only decrease speeds when allowed,
+    // a requested decrease speed delta exists,
     // where no requested increases exist and
     // the increase timer is not running
     // (i.e. not in the middle of increasing)
-    if (decAllowed && _incSpeedDelta == 0 && !_incTimer.isEnabled())
+    if (decAllowed && _decSpeedDelta != 0 &&
+        _incSpeedDelta == 0 && !_incTimer.isEnabled())
     {
         auto requestTarget = getRequestSpeedBase();
         // Request target speed should not start above ceiling