diff --git a/externals/CMakeLists.txt b/externals/CMakeLists.txt
index d86e6e34e4..64c7c489fb 100644
--- a/externals/CMakeLists.txt
+++ b/externals/CMakeLists.txt
@@ -199,7 +199,7 @@ endif()
 
 # httplib
 add_library(httplib INTERFACE)
-target_include_directories(httplib INTERFACE ./httplib)
+target_include_directories(httplib SYSTEM INTERFACE ./httplib)
 target_compile_options(httplib INTERFACE -DCPPHTTPLIB_OPENSSL_SUPPORT)
 target_link_libraries(httplib INTERFACE ${OPENSSL_LIBRARIES})