diff --git a/src/opentx.cpp b/src/opentx.cpp
index cc27edf16..7c90956f3 100644
--- a/src/opentx.cpp
+++ b/src/opentx.cpp
@@ -293,7 +293,7 @@ void per10ms()
 #endif
 
 #if defined(FRSKY) || defined(JETI)
-  if (!IS_DSM2_SERIAL_PROTOCOL(s_current_protocol))
+  if (!IS_DSM2_SERIAL_PROTOCOL(s_current_protocol[0]))
     telemetryInterrupt10ms();
 #endif