diff --git a/slsDetectorServers/jungfrauDetectorServer/slsDetectorFunctionList.c b/slsDetectorServers/jungfrauDetectorServer/slsDetectorFunctionList.c
index ce706d0e5..4bc9846a3 100644
--- a/slsDetectorServers/jungfrauDetectorServer/slsDetectorFunctionList.c
+++ b/slsDetectorServers/jungfrauDetectorServer/slsDetectorFunctionList.c
@@ -2817,7 +2817,8 @@ void *start_timer(void *arg) {
         getNextFrameNumber(&frameNr);
         int iRxEntry = firstDest;
         for (int iframes = 0; iframes != numFrames; ++iframes) {
-            usleep(transmissionDelayUs);
+            if (transmissionDelayUs)
+                usleep(transmissionDelayUs);
 
             // check if manual stop
             if (sharedMemory_getStop() == 1) {
diff --git a/slsDetectorServers/moenchDetectorServer/slsDetectorFunctionList.c b/slsDetectorServers/moenchDetectorServer/slsDetectorFunctionList.c
index 7f7342e79..bebb87f8f 100644
--- a/slsDetectorServers/moenchDetectorServer/slsDetectorFunctionList.c
+++ b/slsDetectorServers/moenchDetectorServer/slsDetectorFunctionList.c
@@ -1927,7 +1927,8 @@ void *start_timer(void *arg) {
         getNextFrameNumber(&frameNr);
         int iRxEntry = firstDest;
         for (int iframes = 0; iframes != numFrames; ++iframes) {
-            usleep(transmissionDelayUs);
+            if (transmissionDelayUs)
+                usleep(transmissionDelayUs);
 
             // check if manual stop
             if (sharedMemory_getStop() == 1) {