diff --git a/BTHID.cpp b/BTHID.cpp
index 3e626b18..ab1617dc 100644
--- a/BTHID.cpp
+++ b/BTHID.cpp
@@ -24,7 +24,7 @@ BTHID::BTHID(BTD *p, bool pair, const char *pin) :
 pBtd(p), // pointer to USB class instance - mandatory
 protocolMode(HID_BOOT_PROTOCOL)
 {
-        for (uint8_t i = 0; i < epMUL; i++)
+        for (uint8_t i = 0; i < NUM_PARSERS; i++)
                 pRptParser[i] = NULL;
 
         if (pBtd)
diff --git a/BTHID.h b/BTHID.h
index 7eae9494..f7d18b10 100644
--- a/BTHID.h
+++ b/BTHID.h
@@ -61,7 +61,7 @@
 
 #define KEYBOARD_PARSER_ID      0
 #define MOUSE_PARSER_ID         1
-#define epMUL                   2
+#define NUM_PARSERS             2
 
 /** This BluetoothService class implements support for the HID keyboard and mice. */
 class BTHID : public BluetoothService {
@@ -124,7 +124,7 @@ public:
 private:
         BTD *pBtd; // Pointer to BTD instance
 
-        HIDReportParser *pRptParser[epMUL];
+        HIDReportParser *pRptParser[NUM_PARSERS];
 
         /** Set report protocol. */
         void setProtocol();