diff --git a/config/kernel-ktime.m4 b/config/kernel-ktime.m4
deleted file mode 100644
index ba9cf14a2..000000000
--- a/config/kernel-ktime.m4
+++ /dev/null
@@ -1,30 +0,0 @@
-dnl #
-dnl # 4.18: ktime_get_raw_ts64() replaces getrawmonotonic64().
-dnl #
-AC_DEFUN([ZFS_AC_KERNEL_SRC_KTIME_GET_RAW_TS64], [
-	ZFS_LINUX_TEST_SRC([ktime_get_raw_ts64], [
-		#include <linux/mm.h>
-	], [
-		struct timespec64 ts;
-		ktime_get_raw_ts64(&ts);
-	])
-])
-
-AC_DEFUN([ZFS_AC_KERNEL_KTIME_GET_RAW_TS64], [
-	AC_MSG_CHECKING([whether ktime_get_raw_ts64() exists])
-	ZFS_LINUX_TEST_RESULT([ktime_get_raw_ts64], [
-		AC_MSG_RESULT(yes)
-		AC_DEFINE(HAVE_KTIME_GET_RAW_TS64, 1,
-		    [ktime_get_raw_ts64() exists])
-	], [
-		AC_MSG_RESULT(no)
-	])
-])
-
-AC_DEFUN([ZFS_AC_KERNEL_SRC_KTIME], [
-	ZFS_AC_KERNEL_SRC_KTIME_GET_RAW_TS64
-])
-
-AC_DEFUN([ZFS_AC_KERNEL_KTIME], [
-	ZFS_AC_KERNEL_KTIME_GET_RAW_TS64
-])
diff --git a/config/kernel.m4 b/config/kernel.m4
index 51459d487..19d001db0 100644
--- a/config/kernel.m4
+++ b/config/kernel.m4
@@ -104,7 +104,6 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_SRC], [
 	ZFS_AC_KERNEL_SRC_KUID_HELPERS
 	ZFS_AC_KERNEL_SRC_RENAME
 	ZFS_AC_KERNEL_SRC_USERNS_CAPABILITIES
-	ZFS_AC_KERNEL_SRC_KTIME
 	ZFS_AC_KERNEL_SRC_TOTALRAM_PAGES_FUNC
 	ZFS_AC_KERNEL_SRC_TOTALHIGH_PAGES
 	ZFS_AC_KERNEL_SRC_PERCPU
@@ -221,7 +220,6 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_RESULT], [
 	ZFS_AC_KERNEL_KUID_HELPERS
 	ZFS_AC_KERNEL_RENAME
 	ZFS_AC_KERNEL_USERNS_CAPABILITIES
-	ZFS_AC_KERNEL_KTIME
 	ZFS_AC_KERNEL_TOTALRAM_PAGES_FUNC
 	ZFS_AC_KERNEL_TOTALHIGH_PAGES
 	ZFS_AC_KERNEL_PERCPU
diff --git a/include/os/linux/spl/sys/time.h b/include/os/linux/spl/sys/time.h
index f76903705..036948d87 100644
--- a/include/os/linux/spl/sys/time.h
+++ b/include/os/linux/spl/sys/time.h
@@ -81,13 +81,8 @@ gethrestime_sec(void)
 static inline hrtime_t
 gethrtime(void)
 {
-#if defined(HAVE_KTIME_GET_RAW_TS64)
 	struct timespec64 ts;
 	ktime_get_raw_ts64(&ts);
-#else
-	struct timespec ts;
-	getrawmonotonic(&ts);
-#endif
 	return (((hrtime_t)ts.tv_sec * NSEC_PER_SEC) + ts.tv_nsec);
 }