diff --git a/src/print.c b/src/print.c
index e0b8eb4..c23f25b 100644
--- a/src/print.c
+++ b/src/print.c
@@ -17,9 +17,9 @@ void printState(Machine *state, FILE *stream) {
 void printRegisters(Machine *state, FILE *stream) {
     fprintf(stream, "Registers:\n");
     for (int i = 0; i < REGISTER_COUNT; i++) {
-        fprintf(stream, "X%02d\t= %016llx\n", i, state->registers[i]);
+        fprintf(stream, "X%02d\t= %016" PRIu64 "\n", i, state->registers[i]);
     }
-    fprintf(stream, "PC\t= %016llx\n", state->pc);
+    fprintf(stream, "PC\t= %016" PRIu64 "\n", state->pc);
     fprintf(stream, "PSTATE\t: %c%c%c%c", state->conditionCodes.Negative ? 'N' : UNSET_CONDITION_CODE_CHAR,
                                           state->conditionCodes.Zero ? 'Z' : UNSET_CONDITION_CODE_CHAR,
                                           state->conditionCodes.Carry ? 'C' : UNSET_CONDITION_CODE_CHAR,