diff --git a/sys/msdos/video.c b/sys/msdos/video.c
index 916a3518d..57911edab 100644
--- a/sys/msdos/video.c
+++ b/sys/msdos/video.c
@@ -174,28 +174,28 @@ term_curs_set(int visibility)
         return;
 
     if (!visibility) {
-	if (!iflags.grmode) {
+        if (!iflags.grmode) {
             txt_hide_cursor();
 #ifdef SCREEN_VGA
-	} else if (iflags.usevga) {
-	    vga_hide_cursor();
+        } else if (iflags.usevga) {
+            vga_hide_cursor();
 #endif
 #ifdef SCREEN_VESA
-	} else if (iflags.usevesa) {
-	    vesa_hide_cursor();
-	}
+        } else if (iflags.usevesa) {
+            vesa_hide_cursor();
+        }
 #endif
     } else if (visibility) {
-	if (!iflags.grmode) {
+        if (!iflags.grmode) {
             txt_show_cursor();
 #ifdef SCREEN_VGA
-	} else if (iflags.usevga) {
+        } else if (iflags.usevga) {
             vga_show_cursor();
 #endif
 #ifdef SCREEN_VESA
-	} else if (iflags.usevesa) {
+        } else if (iflags.usevesa) {
             vesa_show_cursor();
-	}
+        }
 #endif
     }
     vis = visibility;
diff --git a/sys/windows/consoletty.c b/sys/windows/consoletty.c
index 10bc06c37..ed44f1271 100644
--- a/sys/windows/consoletty.c
+++ b/sys/windows/consoletty.c
@@ -98,22 +98,22 @@ cell_t undefined_cell = { CONSOLE_UNDEFINED_CHARACTER,
                           CONSOLE_UNDEFINED_ATTRIBUTE };
 #else /* VIRTUAL_TERMINAL_SEQUENCES */
 cell_t clear_cell = {
-	        { CONSOLE_CLEAR_CHARACTER, 0, 0, 0, 0, 0, 0 },
+                { CONSOLE_CLEAR_CHARACTER, 0, 0, 0, 0, 0, 0 },
                 CONSOLE_CLEAR_CHARACTER,         /* wcharacter */
-		0,                               /* attr */
-		0L,                              /* color24 */
-		0,                               /* color256idx */
-		"\x1b[0m",                       /* bkcolorseq */
-		0                                /* colorseq */
+                0,                               /* attr */
+                0L,                              /* color24 */
+                0,                               /* color256idx */
+                "\x1b[0m",                       /* bkcolorseq */
+                0                                /* colorseq */
 };
 cell_t undefined_cell = {
-		{ CONSOLE_UNDEFINED_CHARACTER, 0, 0, 0, 0, 0, 0 },
+               { CONSOLE_UNDEFINED_CHARACTER, 0, 0, 0, 0, 0, 0 },
                 CONSOLE_UNDEFINED_CHARACTER,     /* wcharacter */
-		0,                               /* attr */
-		0L,                              /* color24 */
-		0,                               /* color256idx */
-		(const char *) 0,                /* bkcolorseq */
-		(const char *) 0                 /* colorseq */
+                0,                               /* attr */
+                0L,                              /* color24 */
+                0,                               /* color256idx */
+                (const char *) 0,                /* bkcolorseq */
+                (const char *) 0                 /* colorseq */
 };
 #if 0
 static const uint8 empty_utf8str[MAX_UTF8_SEQUENCE] = { 0 };
@@ -1146,7 +1146,7 @@ CtrlHandler(DWORD ctrltype)
     case CTRL_BREAK_EVENT:
         term_clear_screen();
         FALLTHROUGH;
-	/* FALLTHRU */
+        /* FALLTHRU */
     case CTRL_CLOSE_EVENT:
     case CTRL_LOGOFF_EVENT:
     case CTRL_SHUTDOWN_EVENT:
@@ -1308,8 +1308,8 @@ really_move_cursor(void)
             oldtitle[39] = '\0';
         }
         Snprintf(newtitle, sizeof newtitle,
-		 "%-55s tty=(%02d,%02d) consoletty=(%02d,%02d)",
-		 oldtitle,
+                 "%-55s tty=(%02d,%02d) consoletty=(%02d,%02d)",
+                 oldtitle,
                  ttyDisplay->curx, ttyDisplay->cury,
                  console.cursor.X, console.cursor.Y);
         (void) SetConsoleTitle(newtitle);
diff --git a/sys/windows/windsys.c b/sys/windows/windsys.c
index d1327869f..88f1a69bf 100644
--- a/sys/windows/windsys.c
+++ b/sys/windows/windsys.c
@@ -1338,8 +1338,8 @@ printf("E2: M=%s e=%d\n",msg,errnum);
 
 int
 win32_cr_gettrace(int maxframes USED_IF_BACKTRACE,
-		  char *out USED_IF_BACKTRACE,
-		  int outsize USED_IF_BACKTRACE)
+                  char *out USED_IF_BACKTRACE,
+                  int outsize USED_IF_BACKTRACE)
 {
 #ifdef USE_BACKTRACE
     userstate.error_count = 0;