diff --git a/include/instructions.h b/include/instructions.h
index 65c2033..c5626f2 100644
--- a/include/instructions.h
+++ b/include/instructions.h
@@ -29,6 +29,14 @@ public:
 
   void add_rm32_r32();  // 0x01
   void xor_rm32_r32();  // 0x31
+  void inc_eax();       // 0x40
+  void inc_ecx();       // 0x41
+  void inc_edx();       // 0x42
+  void inc_ebx();       // 0x43
+  void inc_esp();       // 0x44
+  void inc_ebp();       // 0x45
+  void inc_esi();       // 0x46
+  void inc_edi();       // 0x47
   void dec_eax();       // 0x48
   void dec_ecx();       // 0x49
   void dec_edx();       // 0x4a
diff --git a/instructions.cpp b/instructions.cpp
index 1697262..84574fd 100644
--- a/instructions.cpp
+++ b/instructions.cpp
@@ -22,6 +22,14 @@ void Instructions::init_instructions(){
 
   this->instructions[0x01] = &Instructions::add_rm32_r32;
   this->instructions[0x31] = &Instructions::xor_rm32_r32;
+  this->instructions[0x40] = &Instructions::inc_eax;
+  this->instructions[0x41] = &Instructions::inc_ecx;
+  this->instructions[0x42] = &Instructions::inc_edx;
+  this->instructions[0x43] = &Instructions::inc_ebx;
+  this->instructions[0x44] = &Instructions::inc_esp;
+  this->instructions[0x45] = &Instructions::inc_ebp;
+  this->instructions[0x46] = &Instructions::inc_esi;
+  this->instructions[0x47] = &Instructions::inc_edi;
   this->instructions[0x48] = &Instructions::dec_eax;
   this->instructions[0x49] = &Instructions::dec_ecx;
   this->instructions[0x4a] = &Instructions::dec_edx;
@@ -165,6 +173,46 @@ void Instructions::xor_rm32_r32(){
   }
 }
 
+void Instructions::inc_eax(){
+  //printf("inc_eax called.\n");
+  this->registers[0]++;
+}
+
+void Instructions::inc_ecx(){
+  //printf("inc_ecx called.\n");
+  this->registers[1]++;
+}
+
+void Instructions::inc_edx(){
+  //printf("inc_edx called.\n");
+  this->registers[2]++;
+}
+
+void Instructions::inc_ebx(){
+  //printf("inc_ebx called.\n");
+  this->registers[3]++;
+}
+
+void Instructions::inc_esp(){
+  //printf("inc_esp called.\n");
+  this->registers[4]++;
+}
+
+void Instructions::inc_ebp(){
+  //printf("inc_ebp called.\n");
+  this->registers[5]++;
+}
+
+void Instructions::inc_esi(){
+  //printf("inc_esi called.\n");
+  this->registers[6]++;
+}
+
+void Instructions::inc_edi(){
+  //printf("inc_edi called.\n");
+  this->registers[7]++;
+}
+
 void Instructions::dec_eax(){
   //printf("dec_eax called.\n");
   this->registers[0]--;