diff --git a/z80.cpp b/z80.cpp
index 7e0550b..1cd1df1 100644
--- a/z80.cpp
+++ b/z80.cpp
@@ -64,7 +64,7 @@ byte z80::_fetch_op() {
 	_mc(PC, 4);
 	byte op = _mem[PC];
 #if defined(CPU_DEBUG)
-	printf("%5d MR %04x %02x\n", _ts, PC, op);
+	printf("%5ld MR %04x %02x\n", _ts, PC, op);
 #endif
 	PC++;
 	R++;
@@ -137,14 +137,14 @@ void z80::_step_idx(OP_IDX ops[]) {
 	_mc(PC, 3);
 	byte off = _mem[PC];
 #if defined(CPU_DEBUG)
-	printf("%5d MR %04x %02x\n", _ts, PC, off);
+	printf("%5ld MR %04x %02x\n", _ts, PC, off);
 #endif
 	PC++;
 
 	_mc(PC, 3);
 	byte op = _mem[PC];
 #if defined(CPU_DEBUG)
-	printf("%5d MR %04x %02x\n", _ts, PC, op);
+	printf("%5ld MR %04x %02x\n", _ts, PC, op);
 #endif
 	_mc(PC, 1);
 	_mc(PC, 1);
diff --git a/z80.h b/z80.h
index 73abebe..b4936f7 100644
--- a/z80.h
+++ b/z80.h
@@ -147,29 +147,29 @@ private:
 
 	inline byte _rb(Memory::address a) {
 #if defined(CPU_DEBUG)
-		printf("%5d MC %04x\n", _ts, a);
+		printf("%5ld MC %04x\n", _ts, a);
 #endif
 		ts(3);
 #if defined(CPU_DEBUG)
-		printf("%5d MR %04x %02x\n", _ts, a, (byte)_mem[a]);
+		printf("%5ld MR %04x %02x\n", _ts, a, (byte)_mem[a]);
 #endif
 		return _mem[a];
 	}
 
 	inline void _sb(Memory::address a, byte b) {
 #if defined(CPU_DEBUG)
-		printf("%5d MC %04x\n", _ts, a);
+		printf("%5ld MC %04x\n", _ts, a);
 #endif
 		ts(3);
 #if defined(CPU_DEBUG)
-		printf("%5d MW %04x %02x\n", _ts, a, b);
+		printf("%5ld MW %04x %02x\n", _ts, a, b);
 #endif
 		_mem[a] = b;
 	}
 
 	inline void _mc(Memory::address a, int i) {
 #if defined(CPU_DEBUG)
-		printf("%5d MC %04x\n", _ts, a);
+		printf("%5ld MC %04x\n", _ts, a);
 #endif
 		ts(i);
 	}