diff --git a/i8080.h b/i8080.h
index 960a1ee..fcc2409 100644
--- a/i8080.h
+++ b/i8080.h
@@ -11,7 +11,7 @@ public:
 	void run(unsigned);
 	void reset();
 	void raise(int);
-	char *status(char *buf, size_t n, bool hdr);
+	char *status(char *buf, size_t n, bool hdr=false);
 
 	void checkpoint(Stream &);
 	void restore(Stream &);
diff --git a/r6502.h b/r6502.h
index 624fc27..7bd9891 100644
--- a/r6502.h
+++ b/r6502.h
@@ -11,7 +11,7 @@ public:
 	void raise(int);
 	void reset();
 	void run(unsigned);
-	char *status(char *buf, size_t n, bool hdr);
+	char *status(char *buf, size_t n, bool hdr=false);
 	void checkpoint(Stream &);
 	void restore(Stream &);
 
diff --git a/z80.h b/z80.h
index 452525b..393a77c 100644
--- a/z80.h
+++ b/z80.h
@@ -11,7 +11,7 @@ public:
 	void run(unsigned);
 	void reset();
 	void raise(int level) { _irq_pending = level; }
-	char *status(char *buf, size_t n, bool hdr);
+	char *status(char *buf, size_t n, bool hdr=false);
 
 	void checkpoint(Stream &);
 	void restore(Stream &);