diff --git a/src/modules/CC1101/CC1101.cpp b/src/modules/CC1101/CC1101.cpp
index 9407523b..11027230 100644
--- a/src/modules/CC1101/CC1101.cpp
+++ b/src/modules/CC1101/CC1101.cpp
@@ -506,7 +506,9 @@ int16_t CC1101::setFrequencyDeviation(float freqDev) {
     newFreqDev = 1.587;
   }
 
-  RADIOLIB_CHECK_RANGE(newFreqDev, 1.587, 380.8, RADIOLIB_ERR_INVALID_FREQUENCY_DEVIATION);
+  if (_modulation != RADIOLIB_CC1101_MOD_FORMAT_ASK_OOK) {
+    RADIOLIB_CHECK_RANGE(newFreqDev, 1.587, 380.8, RADIOLIB_ERR_INVALID_FREQUENCY_DEVIATION);
+  }
 
   // set mode to standby
   SPIsendCommand(RADIOLIB_CC1101_CMD_IDLE);