diff --git a/app/spectrum.c b/app/spectrum.c
index f8326ce..c8af382 100644
--- a/app/spectrum.c
+++ b/app/spectrum.c
@@ -1183,9 +1183,7 @@ void APP_RunSpectrum() {
 
   RelaunchScan();
 
-  for (int i = 0; i < 128; ++i) {
-    rssiHistory[i] = 0;
-  }
+  memset(rssiHistory, 0, sizeof(rssiHistory));
 
   isInitialized = true;
 
diff --git a/ui/helper.c b/ui/helper.c
index 482c70e..5a0ec69 100644
--- a/ui/helper.c
+++ b/ui/helper.c
@@ -184,10 +184,11 @@ void UI_DisplayFrequency(const char *string, uint8_t X, uint8_t Y, bool center)
 
 void UI_DrawPixelBuffer(uint8_t (*buffer)[128], uint8_t x, uint8_t y, bool black) 
 {
+	const uint8_t pattern = 1 << (y % 8);
 	if(black)
-		buffer[y/8][x] |= 1 << (y%8);
+		buffer[y/8][x] |= pattern;
 	else
-		buffer[y/8][x] &= ~(1 << (y%8));
+		buffer[y/8][x] &= ~pattern;
 }
 
 static void sort(int16_t *a, int16_t *b)