diff --git a/Makefile b/Makefile
index 3154a2f..243b744 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 CFLAGS+= -std=c99 -Wall -Wextra -pedantic -Wno-deprecated-declarations
-LDADD+= -lX11
+LDADD+= -lX11 -lXext
 LDFLAGS=
 PREFIX?= /usr
 BINDIR?= $(PREFIX)/bin
diff --git a/config.def.h b/config.def.h
index 3cef34b..e7f1518 100644
--- a/config.def.h
+++ b/config.def.h
@@ -2,6 +2,7 @@
 #define CONFIG_H
 
 #define MOD Mod4Mask
+#define ROUND_CORNERS 20
 
 const char* menu[]    = {"dmenu_run",      0};
 const char* term[]    = {"st",             0};
diff --git a/sowm.c b/sowm.c
index 126aca0..5c99c5c 100644
--- a/sowm.c
+++ b/sowm.c
@@ -3,6 +3,7 @@
 #include <X11/Xlib.h>
 #include <X11/XF86keysym.h>
 #include <X11/keysym.h>
+#include <X11/extensions/shape.h>
 #include <stdlib.h>
 #include <signal.h>
 #include <unistd.h>
@@ -41,6 +42,7 @@ static void win_del(Window w);
 static void win_fs();
 static void win_kill();
 static void win_next();
+static void win_round_corners(Window w, int rad);
 static void win_to_ws(const Arg arg);
 static void ws_go(const Arg arg);
 static int  xerror() { return 0;}
@@ -105,6 +107,9 @@ void notify_motion(XEvent *e) {
         wy + (mouse.button == 1 ? yd : 0),
         ww + (mouse.button == 3 ? xd : 0),
         wh + (mouse.button == 3 ? yd : 0));
+
+    if (mouse.button == 3)
+        win_round_corners(mouse.subwindow, ROUND_CORNERS);
 }
 
 void key_press(XEvent *e) {
@@ -201,9 +206,44 @@ void win_fs() {
 
         } else
             XMoveResizeWindow(d, cur, c->wx, c->wy, c->ww, c->wh);
+
+        win_round_corners(cur, c->f ? 0 : ROUND_CORNERS);
     }
 }
 
+void win_round_corners(Window w, int rad) {
+    unsigned int ww, wh, dia = 2 * rad;
+
+    win_size(w, &(int){1}, &(int){1}, &ww, &wh);
+
+    if (ww < dia || wh < dia) return;
+
+    Pixmap mask = XCreatePixmap(d, w, ww, wh, 1);
+
+    if (!mask) return;
+
+    XGCValues xgcv;
+    GC shape_gc = XCreateGC(d, mask, 0, &xgcv);
+
+    if (!shape_gc) {
+        XFreePixmap(d, mask);
+        return;
+    }
+
+    XSetForeground(d, shape_gc, 0);
+    XFillRectangle(d, mask, shape_gc, 0, 0, ww, wh);
+    XSetForeground(d, shape_gc, 1);
+    XFillArc(d, mask, shape_gc, 0, 0, dia, dia, 0, 23040);
+    XFillArc(d, mask, shape_gc, ww-dia-1, 0, dia, dia, 0, 23040);
+    XFillArc(d, mask, shape_gc, 0, wh-dia-1, dia, dia, 0, 23040);
+    XFillArc(d, mask, shape_gc, ww-dia-1, wh-dia-1, dia, dia, 0, 23040);
+    XFillRectangle(d, mask, shape_gc, rad, 0, ww-dia, wh);
+    XFillRectangle(d, mask, shape_gc, 0, rad, ww, wh-dia);
+    XShapeCombineMask(d, w, ShapeBounding, 0, 0, mask, ShapeSet);
+    XFreePixmap(d, mask);
+    XFreeGC(d, shape_gc);
+}
+
 void win_to_ws(const Arg arg) {
     int tmp = ws;
     win_current();
@@ -275,6 +315,7 @@ void map_request(XEvent *e) {
     if (wx == 0 && wy == 0) win_center((Arg){.i = w});
 
     XMapWindow(d, w);
+    win_round_corners(w, ROUND_CORNERS);
     win_focus(w);
     win_add(w);
 }