diff --git a/src/algorithms/telemetry_decoder/gnuradio_blocks/gps_l1_ca_telemetry_decoder_gs.cc b/src/algorithms/telemetry_decoder/gnuradio_blocks/gps_l1_ca_telemetry_decoder_gs.cc
index 60769242f..272359030 100644
--- a/src/algorithms/telemetry_decoder/gnuradio_blocks/gps_l1_ca_telemetry_decoder_gs.cc
+++ b/src/algorithms/telemetry_decoder/gnuradio_blocks/gps_l1_ca_telemetry_decoder_gs.cc
@@ -34,7 +34,7 @@
 
 
 #ifndef _rotl
-#define _rotl(X, N) (((X) << (N)) ^ ((X) >> (32 - (N))))  // Used in the parity check algorithm
+auto _rotl = [](auto x, auto n) { return (((x) << (n)) ^ ((x) >> (32 - (n)))); };  // Used in the parity check algorithm
 #endif