diff --git a/include/instructions.h b/include/instructions.h
index 581752e..a6ae8e3 100644
--- a/include/instructions.h
+++ b/include/instructions.h
@@ -91,6 +91,7 @@ public:
   void mov_ebp_imm32(); // 0xbd
   void mov_esi_imm32(); // 0xbe
   void mov_edi_imm32(); // 0xbf
+  void leave();         // 0xc9
   void call_imm32();    // 0xe8
   void jmp_imm8();      // 0xeb
   void hlt();           // 0xf4
diff --git a/instructions.cpp b/instructions.cpp
index cb730e4..3319f03 100644
--- a/instructions.cpp
+++ b/instructions.cpp
@@ -87,6 +87,7 @@ void Instructions::init_instructions(){
   this->instructions[0xbd] = &Instructions::mov_ebp_imm32;
   this->instructions[0xbe] = &Instructions::mov_esi_imm32;
   this->instructions[0xbf] = &Instructions::mov_edi_imm32;
+  this->instructions[0xc9] = &Instructions::leave;
   this->instructions[0xe8] = &Instructions::call_imm32;
   this->instructions[0xeb] = &Instructions::jmp_imm8;
   this->instructions[0xf4] = &Instructions::hlt;
@@ -1063,6 +1064,15 @@ void Instructions::mov_edi_imm32(){
   this->eip += 4;
 }
 
+void Instructions::leave(){
+  //printf("leave called.\n");
+
+  // mov esp, ebp
+  this->registers[4] = this->registers[5];
+  // pop ebp
+  this->pop_ebp();
+}
+
 void Instructions::call_imm32(){
   //printf("call_imm32 called.\n");