diff --git a/src/extern.h b/src/extern.h
index 0eb811a..a0c0249 100644
--- a/src/extern.h
+++ b/src/extern.h
@@ -207,6 +207,7 @@ extern int   IsNumColon __P((char *, int, char *, int));
 extern void  ShowWindows __P((int));
 extern char *AddWindows __P((char *, int, int, int));
 extern char *AddWindowFlags __P((char *, int, struct win *));
+extern int   NumberOfWindows __P((int));
 extern char *AddOtherUsers __P((char *, int, struct win *));
 extern int   WindowByNoN __P((char *));
 extern struct win *FindNiceWindow __P((struct win *, char *));
diff --git a/src/process.c b/src/process.c
index 0e835f0..eb625dc 100644
--- a/src/process.c
+++ b/src/process.c
@@ -5317,6 +5317,26 @@ int where;
   return ss;
 }
 
+int
+NumberOfWindows(flags)
+int flags;
+{
+  int number_of_windows = 1;
+  struct win **pp, *p;
+
+  for (pp = wtab; pp < wtab + MAXWIN; pp++)
+    {
+      if ((p = *pp) == 0)
+	continue;
+      if ((flags & 1) && display && p == D_fore)
+	continue;
+      if (D_fore && D_fore->w_group != p->w_group)
+	continue;
+      number_of_windows++;
+    }
+  return number_of_windows;
+}
+
 char *
 AddWindowFlags(buf, len, p)
 char *buf;
diff --git a/src/screen.c b/src/screen.c
index edec34a..38b512a 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -2955,6 +2955,13 @@ int rec;
 	      numpad++;
 	    }
 	  break;
+        case 'x':
+          {
+            int number_of_windows = NumberOfWindows((*s == 'w' ? 0 : 1) | (longflg ? 0 : 2) | (plusflg ? 4 : 0) | (minusflg ? 8 : 0));
+            sprintf(p, "%d", number_of_windows);
+            p += strlen(p) - 1;
+          }
+          break;
 	case 'n':
 	  s++;
 	  /* FALLTHROUGH */