diff --git a/src/iperf_tcp.c b/src/iperf_tcp.c
index aaa33bf..925230c 100644
--- a/src/iperf_tcp.c
+++ b/src/iperf_tcp.c
@@ -100,13 +100,13 @@ iperf_tcp_send(struct iperf_stream *sp)
     if (sp->ssl) {
         if (sp->test->zerocopy) {
             if (sp->test->diskfile_name != NULL) {
-                r = Nsendfile_ssl(sp->diskfile_fd, sp->ssl, sp->diskfile_offset, sp->pending_size);
+                r = Nsendfile_ssl(sp->diskfile_fd, sp->ssl, sp->diskfile_offset, sp->pending_size, SF_NOCACHE);
                 sp->diskfile_offset += r;
                 if (sp->diskfile_offset + sp->settings->blksize >= sp->diskfile_sz) {
                     sp->diskfile_offset = r;
                 }
             } else {
-                r = Nsendfile_ssl(sp->buffer_fd, sp->ssl, 0, sp->pending_size);
+                r = Nsendfile_ssl(sp->buffer_fd, sp->ssl, 0, sp->pending_size, 0);
             }
         }
         else {
@@ -116,13 +116,13 @@ iperf_tcp_send(struct iperf_stream *sp)
 #endif
     if (sp->test->zerocopy) {
         if (sp->test->diskfile_name != NULL) {
-            r = Nsendfile(sp->diskfile_fd, sp->socket, sp->diskfile_offset, sp->pending_size);
+            r = Nsendfile(sp->diskfile_fd, sp->socket, sp->diskfile_offset, sp->pending_size, SF_NOCACHE);
             sp->diskfile_offset += r;
             if (sp->diskfile_offset + sp->settings->blksize >= sp->diskfile_sz) {
                 sp->diskfile_offset = r;
             }
         } else {
-            r = Nsendfile(sp->buffer_fd, sp->socket, 0, sp->pending_size);
+            r = Nsendfile(sp->buffer_fd, sp->socket, 0, sp->pending_size, 0);
         }
     } else {
         r = Nwrite(sp->socket, sp->buffer, sp->pending_size, Ptcp);
diff --git a/src/net.c b/src/net.c
index b506dec..63d8e20 100644
--- a/src/net.c
+++ b/src/net.c
@@ -430,7 +430,7 @@ Nwrite_ssl(SSL * ssl, const char *buf, size_t count, int prot)
 
 
 int
-Nsendfile_ssl(int fromfd, SSL* tossl, size_t foffset, size_t count)
+Nsendfile_ssl(int fromfd, SSL* tossl, size_t foffset, size_t count, int flags)
 {
 #if defined(HAVE_SENDFILE)
     off_t offset;
@@ -440,7 +440,7 @@ Nsendfile_ssl(int fromfd, SSL* tossl, size_t foffset, size_t count)
     while (nleft > 0) {
         offset = count - nleft;
 
-        r = SSL_sendfile(tossl, fromfd, foffset + offset, nleft, 0);
+        r = SSL_sendfile(tossl, fromfd, foffset + offset, nleft, flags);
         if (r < 0) {
             int err = SSL_get_error(tossl, r);
             switch (err) {
@@ -546,7 +546,7 @@ has_sendfile(void)
  */
 
 int
-Nsendfile(int fromfd, int tofd, size_t foffset, size_t count)
+Nsendfile(int fromfd, int tofd, size_t foffset, size_t count, int flags)
 {
     off_t offset;
 #if defined(HAVE_SENDFILE)
@@ -564,7 +564,7 @@ Nsendfile(int fromfd, int tofd, size_t foffset, size_t count)
 	if (r > 0)
 	    nleft -= r;
 #elif defined(__FreeBSD__)
-	r = sendfile(fromfd, tofd, foffset + offset, nleft, NULL, &sent, 0);
+	r = sendfile(fromfd, tofd, foffset + offset, nleft, NULL, &sent, flags);
 	nleft -= sent;
 #elif defined(__APPLE__) && defined(__MACH__) && defined(MAC_OS_X_VERSION_10_6)	/* OS X */
 	sent = nleft;
diff --git a/src/net.h b/src/net.h
index 3b131bc..1056354 100644
--- a/src/net.h
+++ b/src/net.h
@@ -34,14 +34,14 @@ int netannounce(int domain, int proto, const char *local, const char *bind_dev,
 int Nread(int fd, char *buf, size_t count, int prot);
 int Nwrite(int fd, const char *buf, size_t count, int prot) /* __attribute__((hot)) */;
 int has_sendfile(void);
-int Nsendfile(int fromfd, int tofd, size_t offset, size_t count) /* __attribute__((hot)) */;
+int Nsendfile(int fromfd, int tofd, size_t offset, size_t count, int flags) /* __attribute__((hot)) */;
 int setnonblocking(int fd, int nonblocking);
 int getsockdomain(int sock);
 int parse_qos(const char *tos);
 
 int Nread_ssl(SSL* ssl, char *buf, size_t count, int prot);
 int Nwrite_ssl(SSL * ssl, const char *buf, size_t count, int prot);
-int Nsendfile_ssl(int fromfd, SSL* tossl, size_t offset, size_t count);
+int Nsendfile_ssl(int fromfd, SSL* tossl, size_t offset, size_t count, int flags);
 
 #define NET_SOFTERROR -1
 #define NET_HARDERROR -2