diff --git a/slsDetectorSoftware/src/DetectorImpl.cpp b/slsDetectorSoftware/src/DetectorImpl.cpp
index e16e57f53..02ddcf7f5 100644
--- a/slsDetectorSoftware/src/DetectorImpl.cpp
+++ b/slsDetectorSoftware/src/DetectorImpl.cpp
@@ -330,7 +330,8 @@ slsDetectorDefs::xy DetectorImpl::getNumberOfChannels() const {
 }
 
 void DetectorImpl::setNumberOfChannels(const slsDetectorDefs::xy c) {
-    if (size() > 1) {
+    // detsize is set before hostname
+    if (size() >= 1) {
         throw RuntimeError(
             "Set the number of channels before setting hostname.");
     }