diff --git a/src/lj_asm_x86.h b/src/lj_asm_x86.h
index fda911e5..40f95636 100644
--- a/src/lj_asm_x86.h
+++ b/src/lj_asm_x86.h
@@ -571,7 +571,7 @@ static void asm_setupresult(ASMState *as, IRIns *ir, const CCallInfo *ci)
       lua_assert(!irt_ispri(ir->t));
       ra_destreg(as, ir, RID_RET);
     }
-  } else if (LJ_32 && irt_isfp(ir->t)) {
+  } else if (LJ_32 && irt_isfp(ir->t) && !(ci->flags & CCI_CASTU64)) {
     emit_x87op(as, XI_FPOP);  /* Pop unused result from x87 st0. */
   }
 }