diff -ru b/src/runtime/sys_linux_386.s a/src/runtime/sys_linux_386.s
--- b/src/runtime/sys_linux_386.s	2018-04-30 22:26:39.000000000 +0200
+++ a/src/runtime/sys_linux_386.s	2018-05-09 17:09:42.319531743 +0200
@@ -287,13 +287,13 @@
 
 	LEAL	8(SP), BX	// &ts (struct timespec)
 	MOVL	BX, 4(SP)
-	MOVL	$1, 0(SP)	// CLOCK_MONOTONIC
+	MOVL	$7, 0(SP)	// CLOCK_BOOTTIME
 	CALL	AX
 	JMP finish
 
 fallback:
 	MOVL	$SYS_clock_gettime, AX
-	MOVL	$1, BX		// CLOCK_MONOTONIC
+	MOVL	$7, BX		// CLOCK_BOOTTIME
 	LEAL	8(SP), CX
 	INVOKE_SYSCALL
 
diff -ru b/src/runtime/sys_linux_amd64.s a/src/runtime/sys_linux_amd64.s
--- b/src/runtime/sys_linux_amd64.s	2018-04-30 22:26:39.000000000 +0200
+++ a/src/runtime/sys_linux_amd64.s	2018-05-09 17:09:42.319531743 +0200
@@ -258,7 +258,7 @@
 	MOVQ	runtime·__vdso_clock_gettime_sym(SB), AX
 	CMPQ	AX, $0
 	JEQ	fallback
-	MOVL	$1, DI // CLOCK_MONOTONIC
+	MOVL	$7, DI // CLOCK_BOOTTIME
 	LEAQ	0(SP), SI
 	CALL	AX
 	MOVQ	0(SP), AX	// sec
diff -ru b/src/runtime/sys_linux_arm64.s a/src/runtime/sys_linux_arm64.s
--- b/src/runtime/sys_linux_arm64.s	2018-04-30 22:26:39.000000000 +0200
+++ a/src/runtime/sys_linux_arm64.s	2018-05-09 17:12:47.844591628 +0200
@@ -201,7 +201,7 @@
 	RET
 
 TEXT runtime·nanotime(SB),NOSPLIT,$24-8
-	MOVW	$1, R0 // CLOCK_MONOTONIC
+	MOVW	$7, R0 // CLOCK_BOOTTIME
 	MOVD	RSP, R1
 	MOVD	$SYS_clock_gettime, R8
 	SVC
diff -ru b/src/runtime/sys_linux_arm.s a/src/runtime/sys_linux_arm.s
--- b/src/runtime/sys_linux_arm.s	2018-04-30 22:26:39.000000000 +0200
+++ a/src/runtime/sys_linux_arm.s	2018-05-09 17:13:18.983281049 +0200
@@ -235,7 +235,7 @@
 
 // int64 nanotime(void)
 TEXT runtime·nanotime(SB),NOSPLIT,$32
-	MOVW	$1, R0  // CLOCK_MONOTONIC
+	MOVW	$7, R0  // CLOCK_BOOTTIME
 	MOVW	$8(R13), R1  // timespec
 	MOVW	$SYS_clock_gettime, R7
 	SWI	$0
diff -ru b/src/runtime/sys_linux_mips64x.s a/src/runtime/sys_linux_mips64x.s
--- b/src/runtime/sys_linux_mips64x.s	2018-04-30 22:26:39.000000000 +0200
+++ a/src/runtime/sys_linux_mips64x.s	2018-05-09 17:09:42.321531721 +0200
@@ -197,7 +197,7 @@
 	RET
 
 TEXT runtime·nanotime(SB),NOSPLIT,$16
-	MOVW	$1, R4 // CLOCK_MONOTONIC
+	MOVW	$7, R4 // CLOCK_BOOTTIME
 	MOVV	$0(R29), R5
 	MOVV	$SYS_clock_gettime, R2
 	SYSCALL
diff -ru b/src/runtime/sys_linux_mipsx.s a/src/runtime/sys_linux_mipsx.s
--- b/src/runtime/sys_linux_mipsx.s	2018-04-30 22:26:39.000000000 +0200
+++ a/src/runtime/sys_linux_mipsx.s	2018-05-09 17:09:42.321531721 +0200
@@ -202,7 +202,7 @@
 	RET
 
 TEXT runtime·nanotime(SB),NOSPLIT,$8-8
-	MOVW	$1, R4	// CLOCK_MONOTONIC
+	MOVW	$7, R4	// CLOCK_BOOTTIME
 	MOVW	$4(R29), R5
 	MOVW	$SYS_clock_gettime, R2
 	SYSCALL
diff -ru b/src/runtime/sys_linux_ppc64x.s a/src/runtime/sys_linux_ppc64x.s
--- b/src/runtime/sys_linux_ppc64x.s	2018-04-30 22:26:39.000000000 +0200
+++ a/src/runtime/sys_linux_ppc64x.s	2018-05-09 17:09:42.322531710 +0200
@@ -176,7 +176,7 @@
 	RET
 
 TEXT runtime·nanotime(SB),NOSPLIT,$16
-	MOVW	$1, R3 // CLOCK_MONOTONIC
+	MOVW	$7, R3 // CLOCK_BOOTTIME
 	MOVD	$0(R1), R4
 	SYSCALL	$SYS_clock_gettime
 	MOVD	0(R1), R3	// sec
diff -ru b/src/runtime/sys_linux_s390x.s a/src/runtime/sys_linux_s390x.s
--- b/src/runtime/sys_linux_s390x.s	2018-04-30 22:26:39.000000000 +0200
+++ a/src/runtime/sys_linux_s390x.s	2018-05-09 17:09:42.322531710 +0200
@@ -188,7 +188,7 @@
 	RET
 
 TEXT runtime·nanotime(SB),NOSPLIT,$16
-	MOVW	$1, R2 // CLOCK_MONOTONIC
+	MOVW	$7, R2 // CLOCK_BOOTTIME
 	MOVD	$tp-16(SP), R3
 	MOVW	$SYS_clock_gettime, R1
 	SYSCALL