diff --git a/src/open9x.cpp b/src/open9x.cpp
index bb2edd267..c93356b45 100644
--- a/src/open9x.cpp
+++ b/src/open9x.cpp
@@ -2041,8 +2041,8 @@ void perOut(uint8_t tick10ms)
           if (swTog) {
             sDelay[i] = md->delayUp * 50;
           }
-          if (sDelay[i]) { // perform delay
-            if(tick10ms) sDelay[i]-=tick10ms;
+          if (sDelay[i] > 0) { // perform delay
+            if (tick10ms) sDelay[i]-=tick10ms;
             if (!md->swtch) {
               v = -1024;
             }
@@ -2062,8 +2062,8 @@ void perOut(uint8_t tick10ms)
         if (swTog) {
           sDelay[i] = md->delayDown * 50;
         }
-        if (sDelay[i]) { // perform delay
-          if(tick10ms) sDelay[i]-=tick10ms;
+        if (sDelay[i] > 0) { // perform delay
+          if (tick10ms) sDelay[i]-=tick10ms;
           if (!md->swtch) v = +1024;
           has_delay = true;
         }