diff --git a/include/libtorrent/receive_buffer.hpp b/include/libtorrent/receive_buffer.hpp
index 4aeac94bd..a909c75c2 100644
--- a/include/libtorrent/receive_buffer.hpp
+++ b/include/libtorrent/receive_buffer.hpp
@@ -40,11 +40,6 @@ POSSIBILITY OF SUCH DAMAGE.
 
 namespace libtorrent {
 
-inline int round_up8(int v)
-{
-	return ((v & 7) == 0) ? v : v + (8 - (v & 7));
-}
-
 struct receive_buffer
 {
 	friend struct crypto_receive_buffer;
diff --git a/src/receive_buffer.cpp b/src/receive_buffer.cpp
index 28584bc76..4d286d2e0 100644
--- a/src/receive_buffer.cpp
+++ b/src/receive_buffer.cpp
@@ -34,6 +34,11 @@ POSSIBILITY OF SUCH DAMAGE.
 
 namespace libtorrent {
 
+int round_up8(int v)
+{
+	return ((v & 7) == 0) ? v : v + (8 - (v & 7));
+}
+
 int receive_buffer::max_receive()
 {
 	int max = packet_bytes_remaining();