diff --git a/libvncclient/sockets.c b/libvncclient/sockets.c
index 8ddfd9d..c243d71 100644
--- a/libvncclient/sockets.c
+++ b/libvncclient/sockets.c
@@ -425,6 +425,10 @@ ConnectClientToUnixSock(const char *sockFile)
   int sock;
   struct sockaddr_un addr;
   addr.sun_family = AF_UNIX;
+  if(strlen(sockFile) + 1 > sizeof(addr.sun_path)) {
+      rfbClientErr("ConnectToUnixSock: socket file name too long\n");
+      return -1;
+  }
   strcpy(addr.sun_path, sockFile);
 
   sock = socket(AF_UNIX, SOCK_STREAM, 0);