diff --git a/src/modules/SX128x/SX1280.cpp b/src/modules/SX128x/SX1280.cpp
index a887b801..fae3516b 100644
--- a/src/modules/SX128x/SX1280.cpp
+++ b/src/modules/SX128x/SX1280.cpp
@@ -177,7 +177,7 @@ float SX1280::getRangingResult() {
 
   // calculate the real result
   uint32_t uraw = ((uint32_t)data[0] << 16) | ((uint32_t)data[1] << 8) | data[2];
-  int32_t raw = (uraw & ((1<<23) - 1)) | (uraw >> 23 << 31);
+  int32_t raw = (uraw & ((1UL << 23) - 1)) | (uraw >> 23 << 31);
   return((float)raw * 150.0 / (4.096 * this->bandwidthKhz));
 }