diff --git a/src/main.c b/src/main.c
index 47893ad..824fa21 100644
--- a/src/main.c
+++ b/src/main.c
@@ -388,13 +388,13 @@ op_handler(void)
                     pc += 2;
                     return 1;
                 case 0xF055:
-                    for (register uint_fast8_t t = 0; t < X; ++t)
-                        memory[i + t] = v[t];
+                    memcpy(memory + i, v, ((X) + 1) * sizeof(byte));
+                    i += (X) + 1;
                     pc += 2;
                     return 1;
                 case 0xF065:
-                    for (register uint_fast8_t t = 0; t < X; ++t)
-                        v[t] = memory[i + t];
+                    memcpy(v, memory + i, ((X) + 1) * sizeof(byte));
+                    i += (X) + 1;
                     pc += 2;
                     return 1;
                 default: