diff --git a/src/llc.cpp b/src/llc.cpp
index 3a50bc7..2997ec1 100644
--- a/src/llc.cpp
+++ b/src/llc.cpp
@@ -31,13 +31,13 @@
 /* reset LLC frame */
 void gprs_llc::reset()
 {
-	index = 0;
+	m_index = 0;
 	m_length = 0;
 }
 
 void gprs_llc::reset_frame_space()
 {
-	index = 0;
+	m_index = 0;
 }
 
 void gprs_llc::enqueue(struct msgb *llc_msg)
@@ -48,14 +48,14 @@
 void gprs_llc::put_frame(const uint8_t *data, size_t len)
 {
 	/* only put frames when we are empty */
-	OSMO_ASSERT(index == 0 && m_length == 0);
+	OSMO_ASSERT(m_index == 0 && m_length == 0);
 	append_frame(data, len);
 }
 
 void gprs_llc::append_frame(const uint8_t *data, size_t len)
 {
 	/* TODO: bounds check */
-	memcpy(frame + index, data, len);
+	memcpy(frame + m_index, data, len);
 	m_length += len;
 }
 
diff --git a/src/llc.h b/src/llc.h
index b22b1c2..f83b9f9 100644
--- a/src/llc.h
+++ b/src/llc.h
@@ -50,19 +50,19 @@
 	bool fits_in_current_frame(uint8_t size) const;
 
 	uint8_t frame[LLC_MAX_LEN]; /* current DL or UL frame */
-	uint16_t index; /* current write/read position of frame */
+	uint16_t m_index; /* current write/read position of frame */
 	uint16_t m_length; /* len of current DL LLC_frame, 0 == no frame */
 	struct llist_head queue; /* queued LLC DL data */
 };
 
 inline uint16_t gprs_llc::chunk_size() const
 {
-	return m_length - index;
+	return m_length - m_index;
 }
 
 inline uint16_t gprs_llc::remaining_space() const
 {
-	return LLC_MAX_LEN - index;
+	return LLC_MAX_LEN - m_index;
 }
 
 inline uint16_t gprs_llc::frame_length() const
@@ -72,17 +72,17 @@
 
 inline void gprs_llc::consume(size_t len)
 {
-	index += len;
+	m_index += len;
 }
 
 inline void gprs_llc::consume(uint8_t *data, size_t len)
 {
 	/* copy and increment index */
-	memcpy(data, frame + index, len);
-	index += len;
+	memcpy(data, frame + m_index, len);
+	consume(len);
 }
 
 inline bool gprs_llc::fits_in_current_frame(uint8_t chunk_size) const
 {
-	return index + chunk_size <= LLC_MAX_LEN;
+	return m_index + chunk_size <= LLC_MAX_LEN;
 }