diff --git a/src/lj_asm_arm.h b/src/lj_asm_arm.h
index afb1054e..196f797e 100644
--- a/src/lj_asm_arm.h
+++ b/src/lj_asm_arm.h
@@ -91,6 +91,7 @@ static MCode *asm_exitstub_gen(ASMState *as, ExitNo group)
   *mxp++ = group*EXITSTUBS_PER_GROUP;
   for (i = 0; i < EXITSTUBS_PER_GROUP; i++)
     *mxp++ = ARMI_B|((-6-i)&0x00ffffffu);
+  lj_mcode_sync(as->mcbot, mxp);
   lj_mcode_commitbot(as->J, mxp);
   as->mcbot = mxp;
   as->mclim = as->mcbot + MCLIM_REDZONE;
diff --git a/src/lj_asm_mips.h b/src/lj_asm_mips.h
index dcc74ce9..b41e3dfe 100644
--- a/src/lj_asm_mips.h
+++ b/src/lj_asm_mips.h
@@ -71,6 +71,7 @@ static void asm_sparejump_setup(ASMState *as)
     memset(mxp+2, 0, MIPS_SPAREJUMP*8);
     mxp += MIPS_SPAREJUMP*2;
     lua_assert(mxp < as->mctop);
+    lj_mcode_sync(as->mcbot, mxp);
     lj_mcode_commitbot(as->J, mxp);
     as->mcbot = mxp;
     as->mclim = as->mcbot + MCLIM_REDZONE;