diff --git a/src/algorithms/PVT/libs/CMakeLists.txt b/src/algorithms/PVT/libs/CMakeLists.txt
index e8a2d1188..fdaf03804 100644
--- a/src/algorithms/PVT/libs/CMakeLists.txt
+++ b/src/algorithms/PVT/libs/CMakeLists.txt
@@ -90,7 +90,7 @@ get_filename_component(PROTO_INCLUDE_HEADERS ${PROTO_HDRS} DIRECTORY)
 target_include_directories(pvt_libs
     PUBLIC
         ${CMAKE_SOURCE_DIR}/src/core/receiver
-        ${PROTO_INCLUDE_HEADERS}
+        SYSTEM ${PROTO_INCLUDE_HEADERS}
 )
 
 target_compile_definitions(pvt_libs PRIVATE -DGNSS_SDR_VERSION="${VERSION}")
diff --git a/src/core/monitor/CMakeLists.txt b/src/core/monitor/CMakeLists.txt
index 991815cfe..650ca63fb 100644
--- a/src/core/monitor/CMakeLists.txt
+++ b/src/core/monitor/CMakeLists.txt
@@ -59,7 +59,7 @@ get_filename_component(PROTO_INCLUDE_HEADERS ${PROTO_HDRS} DIRECTORY)
 
 target_include_directories(core_monitor
     PUBLIC
-        ${PROTO_INCLUDE_HEADERS}
+        SYSTEM ${PROTO_INCLUDE_HEADERS}
 )
 
 if(GNURADIO_USES_STD_POINTERS)