diff --git a/src/runtime/sys_windows_386.s b/src/runtime/sys_windows_386.s
index 64b1285..0b39335 100644
--- a/src/runtime/sys_windows_386.s
+++ b/src/runtime/sys_windows_386.s
@@ -58,7 +58,9 @@
 	MOVL	DX, 12(SP)
 	MOVL	$0, 16(SP) // overlapped
 	CALL	*runtime·_WriteFile(SB)
-	MOVL	BP, SI
+
+	// Does not return.
+	CALL	runtime·abort(SB)
 	RET
 
 // faster get/set last error
diff --git a/src/runtime/sys_windows_amd64.s b/src/runtime/sys_windows_amd64.s
index e5e2083..e778284 100644
--- a/src/runtime/sys_windows_amd64.s
+++ b/src/runtime/sys_windows_amd64.s
@@ -96,6 +96,8 @@
 	MOVQ	runtime·_WriteFile(SB), AX
 	CALL	AX
 
+	// Does not return.
+	CALL	runtime·abort(SB)
 	RET
 
 // faster get/set last error
diff --git a/src/runtime/sys_windows_arm.s b/src/runtime/sys_windows_arm.s
index 189d2f6..48f8c7d 100644
--- a/src/runtime/sys_windows_arm.s
+++ b/src/runtime/sys_windows_arm.s
@@ -97,8 +97,8 @@
 	MOVW	runtime·_WriteFile(SB), R12
 	BL	(R12)
 
-	MOVW	R4, R13			// restore SP
-	MOVM.IA.W (R13), [R4, R15]	// pop {r4, pc}
+	// Does not return.
+	B	runtime·abort(SB)
 
 TEXT runtime·getlasterror(SB),NOSPLIT,$0
 	MRC	15, 0, R0, C13, C0, 2
diff --git a/src/runtime/sys_windows_arm64.s b/src/runtime/sys_windows_arm64.s
index 33ac091..7a2e11f 100644
--- a/src/runtime/sys_windows_arm64.s
+++ b/src/runtime/sys_windows_arm64.s
@@ -117,7 +117,9 @@
 	MOVD	runtime·_WriteFile(SB), R12
 	SUB	$16, RSP	// skip over saved frame pointer below RSP
 	BL	(R12)
-	ADD	$16, RSP
+
+	// Does not return.
+	B	runtime·abort(SB)
 
 	RET