diff --git a/sys/compat/linux/linux_time.c b/sys/compat/linux/linux_time.c
--- a/sys/compat/linux/linux_time.c
+++ b/sys/compat/linux/linux_time.c
@@ -287,7 +287,7 @@
 		*n = CLOCK_REALTIME;
 		break;
 	case LINUX_CLOCK_MONOTONIC:
-		*n = CLOCK_MONOTONIC;
+		*n = CLOCK_UPTIME;
 		break;
 	case LINUX_CLOCK_PROCESS_CPUTIME_ID:
 		*n = CLOCK_PROCESS_CPUTIME_ID;
@@ -300,10 +300,10 @@
 		break;
 	case LINUX_CLOCK_MONOTONIC_COARSE:
 	case LINUX_CLOCK_MONOTONIC_RAW:
-		*n = CLOCK_MONOTONIC_FAST;
+		*n = CLOCK_UPTIME_FAST;
 		break;
 	case LINUX_CLOCK_BOOTTIME:
-		*n = CLOCK_UPTIME;
+		*n = CLOCK_MONOTONIC;
 		break;
 	case LINUX_CLOCK_REALTIME_ALARM:
 	case LINUX_CLOCK_BOOTTIME_ALARM:
diff --git a/sys/sys/_clock_id.h b/sys/sys/_clock_id.h
--- a/sys/sys/_clock_id.h
+++ b/sys/sys/_clock_id.h
@@ -78,7 +78,7 @@
  * Linux compatible names.
  */
 #if __BSD_VISIBLE
-#define	CLOCK_BOOTTIME		CLOCK_UPTIME
+#define	CLOCK_BOOTTIME		CLOCK_MONOTONIC
 #define	CLOCK_REALTIME_COARSE	CLOCK_REALTIME_FAST
 #define	CLOCK_MONOTONIC_COARSE	CLOCK_MONOTONIC_FAST
 #endif