diff --git a/lib/arch/CArchNetworkBSD.cpp b/lib/arch/CArchNetworkBSD.cpp
index 44b1a39d..bfdcf20f 100644
--- a/lib/arch/CArchNetworkBSD.cpp
+++ b/lib/arch/CArchNetworkBSD.cpp
@@ -502,7 +502,8 @@ CArchNetworkBSD::throwErrorOnSocket(CArchSocket s)
 	// get the error from the socket layer
 	int err        = 0;
 	socklen_t size = sizeof(err);
-	if (getsockopt(s->m_fd, SOL_SOCKET, SO_ERROR, &err, &size) == -1) {
+	if (getsockopt(s->m_fd, SOL_SOCKET, SO_ERROR,
+							(optval_t*)&err, &size) == -1) {
 		err = errno;
 	}
 
@@ -540,13 +541,15 @@ CArchNetworkBSD::setNoDelayOnSocket(CArchSocket s, bool noDelay)
 	// get old state
 	int oflag;
 	socklen_t size = sizeof(oflag);
-	if (getsockopt(s->m_fd, IPPROTO_TCP, TCP_NODELAY, &oflag, &size) == -1) {
+	if (getsockopt(s->m_fd, IPPROTO_TCP, TCP_NODELAY,
+							(optval_t*)&oflag, &size) == -1) {
 		throwError(errno);
 	}
 
 	int flag = noDelay ? 1 : 0;
 	size     = sizeof(flag);
-	if (setsockopt(s->m_fd, IPPROTO_TCP, TCP_NODELAY, &flag, size) == -1) {
+	if (setsockopt(s->m_fd, IPPROTO_TCP, TCP_NODELAY,
+							(optval_t*)&flag, size) == -1) {
 		throwError(errno);
 	}
 
diff --git a/lib/arch/CArchNetworkBSD.h b/lib/arch/CArchNetworkBSD.h
index 2aaf75d7..b656e14a 100644
--- a/lib/arch/CArchNetworkBSD.h
+++ b/lib/arch/CArchNetworkBSD.h
@@ -25,6 +25,11 @@
 typedef int socklen_t;
 #endif
 
+// old systems may use char* for [gs]etsockopt()'s optval argument.
+// this should be void on modern systems but char is forwards
+// compatible so we always use it.
+typedef char optval_t;
+
 #define ARCH_NETWORK CArchNetworkBSD
 
 class CArchSocketImpl {