diff --git a/src/global.h b/src/global.h
index 66516f2e..09162dd0 100755
--- a/src/global.h
+++ b/src/global.h
@@ -72,7 +72,8 @@
 #define SND_CRD_BLOCK_SIZE_SAMPLES		( BLOCK_DURATION_MS * SND_CRD_SAMPLE_RATE / 1000 )
 
 /* maximum network buffer size (which can be chosen by slider) */
-#define MAX_NET_BUF_SIZE_NUM_BL			12 /* number of blocks */
+#define MAX_NET_BUF_SIZE_NUM_BL			12 /* number of blocks */
+#define MIN_NET_BUF_SIZE_NUM_BL			( BLOCK_SIZE_SAMPLES / MIN_BLOCK_SIZE_SAMPLES )
 
 /* default network buffer size */
 #define DEF_NET_BUF_SIZE_NUM_BL			5 /* number of blocks */
diff --git a/src/llconclientdlg.cpp b/src/llconclientdlg.cpp
index 3b0619a4..72f0f0c9 100755
--- a/src/llconclientdlg.cpp
+++ b/src/llconclientdlg.cpp
@@ -94,7 +94,7 @@ CLlconClientDlg::CLlconClientDlg ( CClient* pNCliP, QWidget* parent,
 	TextSndBufOut->setText("Out: " + QString().setNum(iCurNumOutBuf));
 
 	/* network buffer */
-	SliderNetBuf->setRange(1, MAX_NET_BUF_SIZE_NUM_BL);
+	SliderNetBuf->setRange(MIN_NET_BUF_SIZE_NUM_BL, MAX_NET_BUF_SIZE_NUM_BL);
 	const int iCurNumNetBuf = pClient->GetSockBufSize();
 	SliderNetBuf->setValue(iCurNumNetBuf);
 	TextNetBuf->setText("Size: " + QString().setNum(iCurNumNetBuf));