diff --git a/CMakeLists.txt b/CMakeLists.txt
index 765cdbeb665..64a6f51e0a7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -172,6 +172,7 @@ include(find_ccache)
 
 # Check for IO faculties
 check_symbol_exists(IN6_IS_ADDR_UNSPECIFIED "netinet/in.h" TS_HAS_IN6_IS_ADDR_UNSPECIFIED)
+check_symbol_exists(IP_TOS "netinet/ip.h" TS_HAS_IP_TOS)
 check_symbol_exists(SO_MARK "sys/socket.h" TS_HAS_SO_MARK)
 check_symbol_exists(SO_PEERCRED "sys/socket.h" TS_HAS_SO_PEERCRED)
 check_symbol_exists(TLS1_3_VERSION "${OPENSSL_INCLUDE_DIR}/openssl/ssl.h" TS_USE_TLS13)
diff --git a/include/tscore/ink_config.h.cmake.in b/include/tscore/ink_config.h.cmake.in
index 3075dc43f47..a5e40a71eeb 100644
--- a/include/tscore/ink_config.h.cmake.in
+++ b/include/tscore/ink_config.h.cmake.in
@@ -113,6 +113,7 @@ const int DEFAULT_STACKSIZE = @DEFAULT_STACK_SIZE@;
 #cmakedefine01 TS_HAS_128BIT_CAS
 #cmakedefine01 TS_HAS_BACKTRACE
 #cmakedefine01 TS_HAS_IN6_IS_ADDR_UNSPECIFIED
+#cmakedefine01 TS_HAS_IP_TOS
 #cmakedefine01 TS_HAS_JEMALLOC
 #cmakedefine01 TS_HAS_TCMALLOC
 #cmakedefine01 TS_HAS_TESTS