diff --git a/libraries/AP_HAL/utility/Print.h b/libraries/AP_HAL/utility/Print.h
index 58812c0c3e..a0a55e6878 100644
--- a/libraries/AP_HAL/utility/Print.h
+++ b/libraries/AP_HAL/utility/Print.h
@@ -32,10 +32,14 @@
  *   not on other platforms)
  */
 
-#define DEC 10
-#define HEX 16
-#define OCT 8
-#define BIN 2
+enum {
+    BASE_DEFAULT = 0,
+    BASE_BIN     = 2,
+    BASE_OCT     = 8,
+    BASE_DEC     = 10,
+    BASE_HEX     = 16
+};
+
 
 class AP_HAL::Print {
   private:
@@ -52,21 +56,21 @@ class AP_HAL::Print {
   public:
     size_t print(const char[]);
     size_t print(char);
-    size_t print(unsigned char, int = DEC);
-    size_t print(int, int = DEC);
-    size_t print(unsigned int, int = DEC);
-    size_t print(long, int = DEC);
-    size_t print(unsigned long, int = DEC);
+    size_t print(unsigned char, int = BASE_DEC);
+    size_t print(int, int = BASE_DEC);
+    size_t print(unsigned int, int = BASE_DEC);
+    size_t print(long, int = BASE_DEC);
+    size_t print(unsigned long, int = BASE_DEC);
     size_t print(float , int = 2);
     size_t print(double , int = 2);
 
     size_t println(const char[]);
     size_t println(char);
-    size_t println(unsigned char, int = DEC);
-    size_t println(int, int = DEC);
-    size_t println(unsigned int, int = DEC);
-    size_t println(long, int = DEC);
-    size_t println(unsigned long, int = DEC);
+    size_t println(unsigned char, int = BASE_DEC);
+    size_t println(int, int = BASE_DEC);
+    size_t println(unsigned int, int = BASE_DEC);
+    size_t println(long, int = BASE_DEC);
+    size_t println(unsigned long, int = BASE_DEC);
     size_t println(float , int = 2);
     size_t println(double , int = 2);
     size_t println(void);