diff --git a/src/runtime/rt0_freebsd_arm64.s b/src/runtime/rt0_freebsd_arm64.s
index 3a348c33e2..a938d98262 100644
--- a/src/runtime/rt0_freebsd_arm64.s
+++ b/src/runtime/rt0_freebsd_arm64.s
@@ -45,8 +45,7 @@ TEXT _rt0_arm64_freebsd_lib(SB),NOSPLIT,$184
 
 	// Create a new thread to do the runtime initialization and return.
 	MOVD	_cgo_sys_thread_create(SB), R4
-	CMP	$0, R4
-	BEQ	nocgo
+	CBZ	R4, nocgo
 	MOVD	$_rt0_arm64_freebsd_lib_go(SB), R0
 	MOVD	$0, R1
 	SUB	$16, RSP	// reserve 16 bytes for sp-8 where fp may be saved.
diff --git a/src/runtime/rt0_netbsd_arm64.s b/src/runtime/rt0_netbsd_arm64.s
index 75ecbe5176..2f3b5a5a87 100644
--- a/src/runtime/rt0_netbsd_arm64.s
+++ b/src/runtime/rt0_netbsd_arm64.s
@@ -44,8 +44,7 @@ TEXT _rt0_arm64_netbsd_lib(SB),NOSPLIT,$184
 
 	// Create a new thread to do the runtime initialization and return.
 	MOVD	_cgo_sys_thread_create(SB), R4
-	CMP	$0, R4
-	BEQ	nocgo
+	CBZ	R4, nocgo
 	MOVD	$_rt0_arm64_netbsd_lib_go(SB), R0
 	MOVD	$0, R1
 	SUB	$16, RSP		// reserve 16 bytes for sp-8 where fp may be saved.
diff --git a/src/runtime/rt0_openbsd_arm64.s b/src/runtime/rt0_openbsd_arm64.s
index 12408f2eec..722fab6129 100644
--- a/src/runtime/rt0_openbsd_arm64.s
+++ b/src/runtime/rt0_openbsd_arm64.s
@@ -50,8 +50,7 @@ TEXT _rt0_arm64_openbsd_lib(SB),NOSPLIT,$184
 
 	// Create a new thread to do the runtime initialization and return.
 	MOVD	_cgo_sys_thread_create(SB), R4
-	CMP	$0, R4
-	BEQ	nocgo
+	CBZ	R4, nocgo
 	MOVD	$_rt0_arm64_openbsd_lib_go(SB), R0
 	MOVD	$0, R1
 	SUB	$16, RSP		// reserve 16 bytes for sp-8 where fp may be saved.