diff --git a/cores/arduino/PluggableUSB.cpp b/cores/arduino/PluggableUSB.cpp
index 2c7221d..a8c69d4 100644
--- a/cores/arduino/PluggableUSB.cpp
+++ b/cores/arduino/PluggableUSB.cpp
@@ -25,21 +25,17 @@
 
 #define MAX_MODULES	6
 
-static uint8_t lastIf = CDC_ACM_INTERFACE + CDC_INTERFACE_COUNT;
-static uint8_t lastEp = CDC_FIRST_ENDPOINT + CDC_ENPOINT_COUNT;
-
 extern uint8_t _initEndpoints[];
 
 //PUSBCallbacks cbs[MAX_MODULES];
-static uint8_t modules_count = 0;
 
-static PUSBListNode* rootNode = NULL;
+PluggableUSB_ PluggableUSB;
 
 int PluggableUSB_::getInterface(uint8_t* interfaceNum)
 {
 	int ret = 0;
 	PUSBListNode* node = rootNode;
-	for (uint8_t i=0; i<modules_count; i++) {
+	for (uint8_t i=0; i<modulesCount; i++) {
 		ret = node->getInterface(interfaceNum);
 		node = node->next;
 	}
@@ -50,7 +46,7 @@ int PluggableUSB_::getDescriptor(int8_t t)
 {
 	int ret = 0;
 	PUSBListNode* node = rootNode;
-	for (uint8_t i=0; i<modules_count && ret == 0; i++) {
+	for (uint8_t i=0; i<modulesCount && ret == 0; i++) {
 		ret = node->getDescriptor(t);
 		node = node->next;
 	}
@@ -61,7 +57,7 @@ bool PluggableUSB_::setup(USBSetup& setup, uint8_t j)
 {
 	bool ret = false;
 	PUSBListNode* node = rootNode;
-	for (uint8_t i=0; i<modules_count && ret == false; i++) {
+	for (uint8_t i=0; i<modulesCount && ret == false; i++) {
 		ret = node->setup(setup, j);
 		node = node->next;
 	}
@@ -70,11 +66,11 @@ bool PluggableUSB_::setup(USBSetup& setup, uint8_t j)
 
 bool PluggableUSB_::plug(PUSBListNode *node)
 {
-	if (modules_count >= MAX_MODULES) {
+	if (modulesCount >= MAX_MODULES) {
 		return false;
 	}
 
-	if (modules_count == 0) {
+	if (modulesCount == 0) {
 		rootNode = node;
 	} else {
 		PUSBListNode *current = rootNode;
@@ -91,11 +87,18 @@ bool PluggableUSB_::plug(PUSBListNode *node)
 		_initEndpoints[lastEp] = node->endpointType[i];
 		lastEp++;
 	}
-	modules_count++;
+	modulesCount++;
 	return true;
 	// restart USB layer???
 }
 
+PluggableUSB_::PluggableUSB_() : lastIf(CDC_ACM_INTERFACE + CDC_INTERFACE_COUNT),
+                                 lastEp(CDC_FIRST_ENDPOINT + CDC_ENPOINT_COUNT),
+                                 modulesCount(0), rootNode(NULL)
+{
+	// Empty
+}
+
 #endif
 
 #endif /* if defined(USBCON) */
diff --git a/cores/arduino/PluggableUSB.h b/cores/arduino/PluggableUSB.h
index 0f776c0..93ee15c 100644
--- a/cores/arduino/PluggableUSB.h
+++ b/cores/arduino/PluggableUSB.h
@@ -54,10 +54,17 @@ public:
 
 class PluggableUSB_ {
 public:
-  static bool plug(PUSBListNode *node);
-  static int getInterface(uint8_t* interfaceNum);
-  static int getDescriptor(int8_t t);
-  static bool setup(USBSetup& setup, uint8_t i);
+  PluggableUSB_();
+  bool plug(PUSBListNode *node);
+  int getInterface(uint8_t* interfaceNum);
+  int getDescriptor(int8_t t);
+  bool setup(USBSetup& setup, uint8_t i);
+
+private:
+  uint8_t lastIf;
+  uint8_t lastEp;
+  uint8_t modulesCount;
+  PUSBListNode* rootNode;
 };
 
 extern PluggableUSB_ PluggableUSB;