--- a/tools/mkheader.py
+++ b/tools/mkheader.py
@@ -62,7 +62,7 @@ def usage(msg=None):
     if msg != None:
         sys.stderr.write("mkheader: %s\n" % msg)
 
-    print "Usage: mkheader.py <base-addr> <img_type> <input-file> <output-file>"
+    print("Usage: mkheader.py <base-addr> <img_type> <input-file> <output-file>")
 
     if msg != None:
         exit(1)