diff --git a/src/runtime/internal/syscall/asm_linux_mips64x.s b/src/runtime/internal/syscall/asm_linux_mips64x.s
index 0e88a2d..6b7c524 100644
--- a/src/runtime/internal/syscall/asm_linux_mips64x.s
+++ b/src/runtime/internal/syscall/asm_linux_mips64x.s
@@ -15,6 +15,7 @@
 	MOVV	a4+32(FP), R7
 	MOVV	a5+40(FP), R8
 	MOVV	a6+48(FP), R9
+	MOVV	R0, R3	// reset R3 to 0 as 1-ret SYSCALL keeps it
 	SYSCALL
 	BEQ	R7, ok
 	MOVV	$-1, R1
diff --git a/src/runtime/internal/syscall/asm_linux_mipsx.s b/src/runtime/internal/syscall/asm_linux_mipsx.s
index 050029e..561310f 100644
--- a/src/runtime/internal/syscall/asm_linux_mipsx.s
+++ b/src/runtime/internal/syscall/asm_linux_mipsx.s
@@ -20,6 +20,7 @@
 	MOVW	a6+24(FP), R9
 	MOVW	R8, 16(R29)
 	MOVW	R9, 20(R29)
+	MOVW	R0, R3	// reset R3 to 0 as 1-ret SYSCALL keeps it
 	SYSCALL
 	BEQ	R7, ok
 	MOVW	$-1, R1
diff --git a/src/syscall/asm_linux_mips64x.s b/src/syscall/asm_linux_mips64x.s
index ceafeb6..6c7a6bc 100644
--- a/src/syscall/asm_linux_mips64x.s
+++ b/src/syscall/asm_linux_mips64x.s
@@ -38,7 +38,8 @@
 	MOVV	R0, R8
 	MOVV	R0, R9
 	MOVV	trap+0(FP), R2	// syscall entry
+	MOVV	R0, R3	// reset R3 to zero as 1-ret SYSCALL keeps it
 	SYSCALL
-	MOVV	R2, r1+32(FP)
-	MOVV	R3, r2+40(FP)
+	MOVV	R2, r1+32(FP)	// r1
+	MOVV	R3, r2+40(FP)	// r2
 	RET
diff --git a/src/syscall/asm_linux_mipsx.s b/src/syscall/asm_linux_mipsx.s
index 3e5e8b1..99f0154 100644
--- a/src/syscall/asm_linux_mipsx.s
+++ b/src/syscall/asm_linux_mipsx.s
@@ -29,6 +29,7 @@
 	MOVW	R10, 24(R29)
 	MOVW	R11, 28(R29)
 	MOVW	trap+0(FP), R2	// syscall entry
+	MOVW	R0, R3	// reset R3 to zero as 1-ret SYSCALL keeps it
 	SYSCALL
 	BEQ	R7, ok9
 	MOVW	$-1, R1
@@ -66,6 +67,7 @@
 	MOVW	a2+8(FP), R5
 	MOVW	a3+12(FP), R6
 	MOVW	trap+0(FP), R2	// syscall entry
+	MOVW	R0, R3	// reset R3 to zero as 1-ret SYSCALL keeps it
 	SYSCALL
 	MOVW	R2, r1+16(FP)	// r1
 	MOVW	R3, r2+20(FP)	// r2