diff --git a/radio/src/thirdparty/libopenui/src/bitmapbuffer.cpp b/radio/src/thirdparty/libopenui/src/bitmapbuffer.cpp
index 20e42c70c..ab9b8bb46 100755
--- a/radio/src/thirdparty/libopenui/src/bitmapbuffer.cpp
+++ b/radio/src/thirdparty/libopenui/src/bitmapbuffer.cpp
@@ -344,6 +344,10 @@ class Slope {
 
 void BitmapBuffer::drawAnnulusSector(coord_t x, coord_t y, coord_t internalRadius, coord_t externalRadius, int startAngle, int endAngle, LcdFlags flags)
 {
+  if (endAngle == startAngle) {
+    endAngle += 1;
+  }
+
   Slope startSlope(startAngle);
   Slope endSlope(endAngle);