diff --git a/adb/sysdeps_win32.c b/adb/sysdeps_win32.c
index d41c42c..2105b16 100644
--- a/adb/sysdeps_win32.c
+++ b/adb/sysdeps_win32.c
@@ -781,7 +781,7 @@
 void  disable_tcp_nagle(int fd)
 {
     FH   fh = _fh_from_int(fd);
-    int  on;
+    int  on = 1;
 
     if ( !fh || fh->clazz != &_fh_socket_class )
         return;