diff --git a/instructions.cpp b/instructions.cpp
index e66b860..ba79224 100644
--- a/instructions.cpp
+++ b/instructions.cpp
@@ -308,9 +308,9 @@ void Instructions::cmp_rm32_imm8(){
 
 void Instructions::set_flag(int flag, uint32_t flag_type){
   if (flag) {
-    this->eflags &= ~flag_type;
-  } else {
     this->eflags |= flag_type;
+  } else {
+    this->eflags &= ~flag_type;
   }
 }