diff --git a/src/vm_arm.dasc b/src/vm_arm.dasc
index 9db3b827..8f723f21 100644
--- a/src/vm_arm.dasc
+++ b/src/vm_arm.dasc
@@ -543,9 +543,8 @@ static void build_subroutines(BuildCtx *ctx)
   |1:
   |  beq ->cont_ffi_callback		// cont = 1: return from FFI callback.
   |  // cont = 0: tailcall from C function.
-  |  ldr CARG3, [BASE, FRAME_FUNC]
-  |   sub CARG4, CARG4, #16
-  |   sub RC, CARG4, BASE
+  |  sub CARG4, CARG4, #16
+  |  sub RC, CARG4, BASE
   |  b ->vm_call_tail
   |.endif
   |
@@ -3749,7 +3748,7 @@ static void build_ins(BuildCtx *ctx, BCOp op, int defop)
   case BC_TSETR:
     |  decode_RB8 RB, INS
     |   decode_RC8 RC, INS
-    |  // RA = dst*8, RB = table*8, RC = key*8
+    |  // RA = src*8, RB = table*8, RC = key*8
     |  ldr TAB:CARG2, [BASE, RB]
     |   ldr CARG3, [BASE, RC]
     |     ldrb INS, TAB:CARG2->marked
diff --git a/src/vm_x86.dasc b/src/vm_x86.dasc
index 7b5abdd5..777985a4 100644
--- a/src/vm_x86.dasc
+++ b/src/vm_x86.dasc
@@ -4649,8 +4649,7 @@ static void build_ins(BuildCtx *ctx, BCOp op, int defop)
     |  jnz <4
     |  movzx RA, PC_RA
     |  not RAa
-    |  lea RA, [BASE+RA*8]
-    |  mov LFUNC:KBASE, [RA-8]		// Need to prepare KBASE.
+    |  mov LFUNC:KBASE, [BASE+RA*8-8]	// Need to prepare KBASE.
     |  mov KBASE, LFUNC:KBASE->pc
     |  mov KBASE, [KBASE+PC2PROTO(k)]
     |  jmp <4