diff --git a/build/moz.configure/init.configure b/build/moz.configure/init.configure
index cebdfc52ad76..29d804d44a0a 100644
--- a/build/moz.configure/init.configure
+++ b/build/moz.configure/init.configure
@@ -724,15 +724,6 @@ set_define("HAVE_64BIT_BUILD", have_64_bit)
 add_old_configure_assignment("HAVE_64BIT_BUILD", have_64_bit)
 
 
-@depends(host)
-def host_os_kernel_major_version(host):
-    versions = host.raw_os.split(".")
-    version = "".join(x for x in versions[0] if x.isdigit())
-    return version
-
-
-set_config("HOST_MAJOR_VERSION", host_os_kernel_major_version)
-
 # Autoconf needs these set
 
 
diff --git a/config/external/nspr/pr/moz.build b/config/external/nspr/pr/moz.build
index dc9fa0aefc36..5fdc3c9f1bc2 100644
--- a/config/external/nspr/pr/moz.build
+++ b/config/external/nspr/pr/moz.build
@@ -39,10 +39,7 @@ elif CONFIG["OS_TARGET"] == "Darwin":
     # See also IncreaseDescriptorLimits in toolkit/xre/nsAppRunner.cpp
     DEFINES["FD_SETSIZE"] = 4096
     DEFINES["_DARWIN_UNLIMITED_SELECT"] = True
-    if not CONFIG["HOST_MAJOR_VERSION"]:
-        DEFINES["HAS_CONNECTX"] = True
-    elif CONFIG["HOST_MAJOR_VERSION"] >= "15":
-        DEFINES["HAS_CONNECTX"] = True
+    DEFINES["HAS_CONNECTX"] = True
     DEFINES["DARWIN"] = True
     DEFINES["HAVE_BSD_FLOCK"] = True
     DEFINES["HAVE_SOCKLEN_T"] = True
diff --git a/netwerk/protocol/http/moz.build b/netwerk/protocol/http/moz.build
index 05b52c17ea3f..5d4b6a198004 100644
--- a/netwerk/protocol/http/moz.build
+++ b/netwerk/protocol/http/moz.build
@@ -212,10 +212,4 @@ XPCOM_MANIFESTS += [
     "components.conf",
 ]
 
-if CONFIG["OS_TARGET"] == "Darwin":
-    if not CONFIG["HOST_MAJOR_VERSION"]:
-        DEFINES["HAS_CONNECTX"] = True
-    elif CONFIG["HOST_MAJOR_VERSION"] >= "15":
-        DEFINES["HAS_CONNECTX"] = True
-
 include("/tools/fuzzing/libfuzzer-config.mozbuild")