diff --git a/src/c/tcp.d b/src/c/tcp.d
index 59794554b..ac6b1ecc5 100644
--- a/src/c/tcp.d
+++ b/src/c/tcp.d
@@ -28,6 +28,7 @@ extern int errno;
 #include <sys/socket.h>
 #include <sys/un.h>
 #include <netinet/in.h>
+#include <netinet/tcp.h>
 #include <arpa/inet.h>
 #include <netdb.h>
 #include <unistd.h>
@@ -132,11 +133,11 @@ int connect_to_server(char *host, int port)
 #ifdef TCP_NODELAY
   /* make sure to turn off TCP coalescence */
 #if defined(ECL_MS_WINDOWS_HOST)
-  { char mi;
+  { char mi = 1;
     setsockopt (fd, IPPROTO_TCP, TCP_NODELAY, &mi, sizeof (char));
   }
 #else
-  { int mi;
+  { int mi = 1;
     setsockopt (fd, IPPROTO_TCP, TCP_NODELAY, &mi, sizeof (int));
   }
 #endif
@@ -195,11 +196,11 @@ create_server_port(int port)
 #ifdef TCP_NODELAY
   /* make sure to turn off TCP coalescence */
 #if defined(ECL_MS_WINDOWS_HOST)
-  { char mi;
+  { char mi = 1;
     setsockopt(request, IPPROTO_TCP, TCP_NODELAY, &mi, sizeof (char));
   }
 #else
-  { int mi;
+  { int mi = 1;
     setsockopt(request, IPPROTO_TCP, TCP_NODELAY, &mi, sizeof (int));
   }
 #endif