diff --git a/e6502.h b/e6502.h
index 98dc001..7a70657 100644
--- a/e6502.h
+++ b/e6502.h
@@ -12,14 +12,14 @@ typedef enum {
     e6502_Status_N = 0b10000000,
 } e6502_Status_Flag;
 
-typedef enum {
+typedef enum __attribute__ ((__packed__)) {
     e6502_Pin_NMI = 0b01,
     e6502_Pin_IRQ = 0b10,
 
     e6502_NMI_Serviced = 0b10000000
 } e6502_Pin;
 
-typedef struct {
+typedef struct __attribute__ ((__packed__)) {
     uint16_t PC;
     uint8_t  S;
     uint8_t  A;