diff --git a/src/modules/SX127x/SX1278.cpp b/src/modules/SX127x/SX1278.cpp
index e370d0e3..199d9696 100644
--- a/src/modules/SX127x/SX1278.cpp
+++ b/src/modules/SX127x/SX1278.cpp
@@ -344,9 +344,9 @@ int16_t SX1278::checkOutputPower(int8_t power, int8_t* clipped, bool useRfo) {
   if(useRfo) {
     // RFO output
     if(clipped) {
-      *clipped = RADIOLIB_MAX(-3, RADIOLIB_MIN(15, power));
+      *clipped = RADIOLIB_MAX(-4, RADIOLIB_MIN(15, power));
     }
-    RADIOLIB_CHECK_RANGE(power, -3, 15, RADIOLIB_ERR_INVALID_OUTPUT_POWER);
+    RADIOLIB_CHECK_RANGE(power, -4, 15, RADIOLIB_ERR_INVALID_OUTPUT_POWER);
   } else {
     // PA_BOOST output, check high-power operation
     if(clipped) {
diff --git a/src/modules/SX127x/SX1278.h b/src/modules/SX127x/SX1278.h
index 215e3b28..4b24e9dc 100644
--- a/src/modules/SX127x/SX1278.h
+++ b/src/modules/SX127x/SX1278.h
@@ -202,7 +202,7 @@ class SX1278: public SX127x {
     int16_t checkDataRate(DataRate_t dr) override;
 
     /*!
-      \brief Sets transmission output power. Allowed values range from -3 to 15 dBm (RFO pin) or +2 to +17 dBm (PA_BOOST pin).
+      \brief Sets transmission output power. Allowed values range from -4 to 15 dBm (RFO pin) or +2 to +17 dBm (PA_BOOST pin).
       High power +20 dBm operation is also supported, on the PA_BOOST pin. Defaults to PA_BOOST.
       \param power Transmission output power in dBm.
       \returns \ref status_codes
@@ -210,7 +210,7 @@ class SX1278: public SX127x {
     int16_t setOutputPower(int8_t power) override;
 
     /*!
-      \brief Sets transmission output power. Allowed values range from -3 to 15 dBm (RFO pin) or +2 to +17 dBm (PA_BOOST pin).
+      \brief Sets transmission output power. Allowed values range from -4 to 15 dBm (RFO pin) or +2 to +17 dBm (PA_BOOST pin).
       High power +20 dBm operation is also supported, on the PA_BOOST pin.
       \param power Transmission output power in dBm.
       \param useRfo Whether to use the RFO (true) or the PA_BOOST (false) pin for the RF output.