diff --git a/ambed/Makefile b/ambed/Makefile
index b2dfdbe..d9c0547 100644
--- a/ambed/Makefile
+++ b/ambed/Makefile
@@ -13,9 +13,9 @@ GCC = g++
 
 
 ifeq ($(debug), true)
-CFLAGS = -ggdb3 -W -MMD -MD -std=c++11
+CFLAGS = -ggdb3 -W -Werror -MMD -MD -std=c++11
 else
-CFLAGS = -W -MMD -MD -std=c++11
+CFLAGS = -W -Werror -MMD -MD -std=c++11
 endif
 
 LDFLAGS = -pthread
diff --git a/ambed/ccallsign.cpp b/ambed/ccallsign.cpp
index a9cf00f..ef876c1 100644
--- a/ambed/ccallsign.cpp
+++ b/ambed/ccallsign.cpp
@@ -87,7 +87,7 @@ void CCallsign::SetCallsign(const uint8 *buffer, int len)
 {
 	// set callsign
 	::memset(m_Callsign, ' ', sizeof(m_Callsign));
-	::memcpy(m_Callsign, buffer, MIN(len, sizeof(m_Callsign)));
+	::memcpy(m_Callsign, buffer, MIN(len, (int)sizeof(m_Callsign)));
 	for ( unsigned i = 0; i < sizeof(m_Callsign); i++ )
 	{
 		if ( m_Callsign[i] == 0 )
@@ -105,7 +105,7 @@ void CCallsign::PatchCallsign(int off, const uint8 *patch, int len)
 {
 	if ( off < int(sizeof(m_Callsign)) )
 	{
-		::memcpy(m_Callsign, patch, MIN(len, sizeof(m_Callsign) - off));
+		::memcpy(m_Callsign, patch, MIN(len, (int)sizeof(m_Callsign) - off));
 	}
 }
 
diff --git a/ambed/cvoicepacket.cpp b/ambed/cvoicepacket.cpp
index d62faed..fe91345 100644
--- a/ambed/cvoicepacket.cpp
+++ b/ambed/cvoicepacket.cpp
@@ -39,7 +39,7 @@ CVoicePacket::CVoicePacket()
 
 CVoicePacket::CVoicePacket(const uint8 *voice, int size)
 {
-	m_iSize = MIN(size, sizeof(m_uiVoice));
+	m_iSize = MIN(size, (int)sizeof(m_uiVoice));
 	::memset(m_uiVoice, 0, sizeof(m_uiVoice));
 	::memcpy(m_uiVoice, voice, m_iSize);
 }
@@ -64,8 +64,7 @@ CVoicePacket::~CVoicePacket()
 
 void CVoicePacket::SetVoice(const uint8 *voice, int size)
 {
-	m_iSize = MIN(size, sizeof(m_uiVoice));
+	m_iSize = MIN(size, (int)sizeof(m_uiVoice));
 	::memset(m_uiVoice, 0, sizeof(m_uiVoice));
 	::memcpy(m_uiVoice, voice, m_iSize);
 }
-
diff --git a/ambed/main.h b/ambed/main.h
index b88da3f..09b501b 100644
--- a/ambed/main.h
+++ b/ambed/main.h
@@ -94,8 +94,8 @@ typedef unsigned int            uint;
 ////////////////////////////////////////////////////////////////////////////////////////
 // macros
 
-#define MIN(a,b) 				(int(a) < int(b))?(a):(b)
-#define MAX(a,b) 				(int(a) > int(b))?(a):(b)
+#define MIN(a,b) 				((a)<(b))?(a):(b)
+#define MAX(a,b) 				((a)>(b))?(a):(b)
 #define MAKEWORD(low, high)		((uint16)(((uint8)(low)) | (((uint16)((uint8)(high))) << 8)))
 #define MAKEDWORD(low, high)	((uint32)(((uint16)(low)) | (((uint32)((uint16)(high))) << 16)))
 #define LOBYTE(w)				((uint8)(uint16)(w & 0x00FF))
diff --git a/src/Makefile b/src/Makefile
index 8367b16..a61a1d1 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -29,9 +29,9 @@ DATADIR = /var/lib/xlxd
 CC = g++
 
 ifeq ($(debug), true)
-CFLAGS = -ggdb3 -W -c -std=c++11 -MMD -MD -c
+CFLAGS = -ggdb3 -W -Werror -c -std=c++11 -MMD -MD -c
 else
-CFLAGS = -c -W -std=c++11 -MMD -MD -c
+CFLAGS = -c -W -Werror -std=c++11 -MMD -MD -c
 endif
 
 LDFLAGS=-pthread
diff --git a/src/ccallsign.cpp b/src/ccallsign.cpp
index 77f5a58..55cc323 100644
--- a/src/ccallsign.cpp
+++ b/src/ccallsign.cpp
@@ -173,7 +173,7 @@ void CCallsign::SetCallsign(const uint8 *buffer, int len, bool UpdateDmrid)
 	// set callsign
 	::memset(m_Callsign, ' ', sizeof(m_Callsign));
 	m_Module = ' ';
-	::memcpy(m_Callsign, buffer, MIN(len, sizeof(m_Callsign)-1));
+	::memcpy(m_Callsign, buffer, MIN(len, (int)sizeof(m_Callsign)-1));
 	for ( unsigned i = 0; i < sizeof(m_Callsign); i++ )
 	{
 		if ( m_Callsign[i] == 0 )
@@ -238,7 +238,7 @@ void CCallsign::SetSuffix(const char *sz)
 
 void CCallsign::SetSuffix(const uint8 *buffer, int len)
 {
-	len = MIN(len, sizeof(m_Suffix));
+	len = MIN(len, (int)sizeof(m_Suffix));
 	::memset(m_Suffix, ' ', sizeof(m_Suffix));
 	::memcpy(m_Suffix, buffer, len);
 }
@@ -250,7 +250,7 @@ void CCallsign::PatchCallsign(int off, const uint8 *patch, int len)
 {
 	if ( off < CALLSIGN_LEN )
 	{
-		::memcpy(m_Callsign, patch, MIN(len, sizeof(m_Callsign) - off));
+		::memcpy(m_Callsign, patch, MIN(len, (int)sizeof(m_Callsign) - off));
 	}
 }
 
diff --git a/src/ccallsignlistitem.cpp b/src/ccallsignlistitem.cpp
index 85a8b62..f984bdc 100644
--- a/src/ccallsignlistitem.cpp
+++ b/src/ccallsignlistitem.cpp
@@ -52,7 +52,7 @@ CCallsignListItem::CCallsignListItem(const CCallsign &callsign, const CIp &ip, c
 		}
 		else
 		{
-			int n = MIN((int)::strlen(modules), sizeof(m_Modules)-1);
+			int n = MIN(::strlen(modules), sizeof(m_Modules)-1);
 			int j = 0;
 			for ( int i = 0; i < n; i++ )
 			{
@@ -82,7 +82,7 @@ CCallsignListItem::CCallsignListItem(const CCallsign &callsign, const char *url,
 		}
 		else
 		{
-			int n = MIN((int)::strlen(modules), sizeof(m_Modules)-1);
+			int n = MIN(::strlen(modules), sizeof(m_Modules)-1);
 			int j = 0;
 			for ( int i = 0; i < n; i++ )
 			{
diff --git a/src/main.h b/src/main.h
index b7ff5bb..8ea8210 100644
--- a/src/main.h
+++ b/src/main.h
@@ -221,8 +221,8 @@ typedef unsigned int            uint;
 ////////////////////////////////////////////////////////////////////////////////////////
 // macros
 
-#define MIN(a,b) 				(int(a) < int(b))?(a):(b)
-#define MAX(a,b) 				(int(a) > int(b))?(a):(b)
+#define MIN(a,b) 				((a)<(b))?(a):(b)
+#define MAX(a,b) 				((a)>(b))?(a):(b)
 #define MAKEWORD(low, high)		((uint16)(((uint8)(low)) | (((uint16)((uint8)(high))) << 8)))
 #define MAKEDWORD(low, high)	((uint32)(((uint16)(low)) | (((uint32)((uint16)(high))) << 16)))
 #define LOBYTE(w)				((uint8)(uint16)(w & 0x00FF))