diff --git a/sdrgui/webapi/webapiadaptergui.cpp b/sdrgui/webapi/webapiadaptergui.cpp
index c721e1511..984e712e9 100644
--- a/sdrgui/webapi/webapiadaptergui.cpp
+++ b/sdrgui/webapi/webapiadaptergui.cpp
@@ -1707,7 +1707,7 @@ int WebAPIAdapterGUI::devicesetChannelPost(
 
         if (query.getDirection() == 0) // Single Rx
         {
-            if (!deviceSet->m_deviceSourceEngine || !deviceSet->m_deviceMIMOEngine)
+            if (!deviceSet->m_deviceSourceEngine && !deviceSet->m_deviceMIMOEngine)
             {
                 error.init();
                 *error.getMessage() = QString("Device set at %1 is not a receive capable device set").arg(deviceSetIndex);
@@ -1743,7 +1743,7 @@ int WebAPIAdapterGUI::devicesetChannelPost(
         }
         else if (query.getDirection() == 1) // single Tx
         {
-            if (!deviceSet->m_deviceSinkEngine || !deviceSet->m_deviceMIMOEngine)
+            if (!deviceSet->m_deviceSinkEngine && !deviceSet->m_deviceMIMOEngine)
             {
                 error.init();
                 *error.getMessage() = QString("Device set at %1 is not a transmit capable device set").arg(deviceSetIndex);
diff --git a/sdrsrv/webapi/webapiadaptersrv.cpp b/sdrsrv/webapi/webapiadaptersrv.cpp
index 97f8a5434..d010d72d6 100644
--- a/sdrsrv/webapi/webapiadaptersrv.cpp
+++ b/sdrsrv/webapi/webapiadaptersrv.cpp
@@ -1805,7 +1805,7 @@ int WebAPIAdapterSrv::devicesetChannelPost(
 
         if (query.getDirection() == 0) // Single Rx
         {
-            if (!deviceSet->m_deviceSourceEngine || !deviceSet->m_deviceMIMOEngine)
+            if (!deviceSet->m_deviceSourceEngine && !deviceSet->m_deviceMIMOEngine)
             {
                 error.init();
                 *error.getMessage() = QString("Device set at %1 is not a receive capable device set").arg(deviceSetIndex);
@@ -1841,7 +1841,7 @@ int WebAPIAdapterSrv::devicesetChannelPost(
         }
         else if (query.getDirection() == 1) // single Tx
         {
-            if (!deviceSet->m_deviceSinkEngine || !deviceSet->m_deviceMIMOEngine)
+            if (!deviceSet->m_deviceSinkEngine && !deviceSet->m_deviceMIMOEngine)
             {
                 error.init();
                 *error.getMessage() = QString("Device set at %1 is not a transmit capable device set").arg(deviceSetIndex);