diff --git a/x11/pdcx11.c b/x11/pdcx11.c
index ca87c4b8..583beefb 100644
--- a/x11/pdcx11.c
+++ b/x11/pdcx11.c
@@ -2699,7 +2699,7 @@ MOUSE_STATUS *ms;
    if (trace_on) PDC_debug("%s:XCursesSendKeyToCurses() - called: sending %d\n",(XCursesProcess)?"     X":"CURSES",key);
 #endif
    memcpy(buf,(char *)&key,sizeof(unsigned long));
-   if (write_socket(key_sock,buf,sizeof(int)) < 0)
+   if (write_socket(key_sock,buf,sizeof(unsigned long)) < 0)
       XCursesExitXCursesProcess(1,SIGKILL,"exiting from XCursesSendKeyToCurses");
    if ( ms != NULL )
    {
diff --git a/x11/process/x11curses.c b/x11/process/x11curses.c
index e2fc47e3..290c7f11 100644
--- a/x11/process/x11curses.c
+++ b/x11/process/x11curses.c
@@ -195,7 +195,7 @@ int delaytenths;
          if (read_socket(key_sock,buf,sizeof(unsigned long)) < 0)
             XCursesExitCursesProcess(2,"exiting from XCurses_rawchar"); /* what else ?? */
          memcpy((char *)&newkey,buf,sizeof(unsigned long));
-         pdc_key_modifier = newkey >> 24; /*(sizeof(unsigned long) - sizeof(unsigned char)); */
+         pdc_key_modifier = (newkey >> 24) & 0xFF; /*(sizeof(unsigned long) - sizeof(unsigned char)); */
          key = (int)(newkey & 0x00FFFFFF);
       }
 #if 0
diff --git a/x11/thread/x11curses.c b/x11/thread/x11curses.c
index 3058f4a7..88d103d1 100644
--- a/x11/thread/x11curses.c
+++ b/x11/thread/x11curses.c
@@ -212,7 +212,7 @@ int delaytenths;
          if (read_socket(key_sock,buf,sizeof(unsigned long)) < 0)
             XCursesExitCursesProcess(2,"exiting from XCurses_rawchar"); /* what else ?? */
          memcpy((char *)&newkey,buf,sizeof(unsigned long));
-         pdc_key_modifier = newkey >> 24; /*(sizeof(unsigned long) - sizeof(unsigned char)); */
+         pdc_key_modifier = (newkey >> 24) & 0xFF; /*(sizeof(unsigned long) - sizeof(unsigned char)); */
          key = (int)(newkey & 0x00FFFFFF);
       }
 #if 0