diff --git a/src/add-ons/kernel/network/protocols/unix/UnixFifo.cpp b/src/add-ons/kernel/network/protocols/unix/UnixFifo.cpp
index 7025461048..d2d694178f 100644
--- a/src/add-ons/kernel/network/protocols/unix/UnixFifo.cpp
+++ b/src/add-ons/kernel/network/protocols/unix/UnixFifo.cpp
@@ -77,6 +77,7 @@ UnixBufferQueue::Read(size_t size, net_buffer** _buffer)
 			}
 
 			bytesLeft -= toCopy;
+			fSize -= toCopy;
 		}
 
 		return B_OK;