diff --git a/radio/src/opentx.h b/radio/src/opentx.h
index 71ff97c2e..032a7134c 100644
--- a/radio/src/opentx.h
+++ b/radio/src/opentx.h
@@ -1202,7 +1202,7 @@ union ReusableBuffer
 
   struct
   {
-    int8_t bars[LCD_W];
+    uint8_t bars[LCD_W];
     uint32_t freq;
     uint32_t span;
     uint32_t step;
diff --git a/radio/src/telemetry/frsky_pxx2.cpp b/radio/src/telemetry/frsky_pxx2.cpp
index 039d14c57..116565f27 100644
--- a/radio/src/telemetry/frsky_pxx2.cpp
+++ b/radio/src/telemetry/frsky_pxx2.cpp
@@ -220,7 +220,7 @@ void processSpectrumAnalyserFrame(uint8_t module, uint8_t * frame)
   int32_t position = *frequency - (reusableBuffer.spectrumAnalyser.freq - reusableBuffer.spectrumAnalyser.span / 2);
   uint32_t x = (position * LCD_W / 8) / (reusableBuffer.spectrumAnalyser.span / 8);
   if (x < LCD_W) {
-    reusableBuffer.spectrumAnalyser.bars[x] = 127 + *power;
+    reusableBuffer.spectrumAnalyser.bars[x] = 0x80 + *power;
   }
 }