diff --git a/src/execute.c b/src/execute.c
index b5ad72a..755a0f9 100644
--- a/src/execute.c
+++ b/src/execute.c
@@ -1,3 +1,4 @@
+#include <stdlib.h>
 #include <assert.h>
 #include "execute.h"
 #include "print.h"
@@ -235,6 +236,9 @@ static bool isConditionMet(Machine* state, a64inst_ConditionType cond) {
             return state->conditionCodes.Zero || (state->conditionCodes.Negative != state->conditionCodes.Overflow);
         case AL:
             return true;
+        default:
+            fprintf(stderr, "Unknown condition specified!\n");
+            exit(1);
     }
 }
 
diff --git a/src/print.c b/src/print.c
index 3021356..430f594 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= %" PRIu64 "\n", i, state->registers[i]);
+        fprintf(stream, "X%02d\t= %016x\n", i, (unsigned int)state->registers[i]);
     }
-    fprintf(stream, "PC\t= %" PRIu64 "\n", state->pc);
+    fprintf(stream, "PC\t= %016x\n", (unsigned int)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,