diff --git a/darwin/window.m b/darwin/window.m
index 1a048207..848d3986 100644
--- a/darwin/window.m
+++ b/darwin/window.m
@@ -16,6 +16,7 @@ struct uiWindow {
 	BOOL suppressSizeChanged;
 	int fullscreen;
 	int borderless;
+	int resizeable;
 };
 
 @implementation uiprivNSWindow
@@ -357,6 +358,21 @@ void uiWindowSetMargined(uiWindow *w, int margined)
 	uiprivSingleChildConstraintsSetMargined(&(w->constraints), w->margined);
 }
 
+int uiWindowResizeable(uiWindow *w)
+{
+	return w->resizeable;
+}
+
+void uiWindowSetResizeable(uiWindow *w, int resizeable)
+{
+	w->resizeable = resizeable;
+	if(resizeable){
+		[w->window setStyleMask:[w->window styleMask] | NSResizableWindowMask];
+	} else {
+		[w->window setStyleMask:[w->window styleMask] & ~NSResizableWindowMask];
+	}
+}
+
 static int defaultOnClosing(uiWindow *w, void *data)
 {
 	return 0;
diff --git a/examples/controlgallery/main.c b/examples/controlgallery/main.c
index c0d536c1..f2b42557 100644
--- a/examples/controlgallery/main.c
+++ b/examples/controlgallery/main.c
@@ -311,6 +311,7 @@ int main(void)
 	tab = uiNewTab();
 	uiWindowSetChild(mainwin, uiControl(tab));
 	uiWindowSetMargined(mainwin, 1);
+	uiWindowSetResizeable(mainwin, 0);
 
 	uiTabAppend(tab, "Basic Controls", makeBasicControlsPage());
 	uiTabSetMargined(tab, 0, 1);
diff --git a/ui.h b/ui.h
index b5fb9a27..6636593b 100644
--- a/ui.h
+++ b/ui.h
@@ -130,6 +130,8 @@ _UI_EXTERN void uiWindowSetBorderless(uiWindow *w, int borderless);
 _UI_EXTERN void uiWindowSetChild(uiWindow *w, uiControl *child);
 _UI_EXTERN int uiWindowMargined(uiWindow *w);
 _UI_EXTERN void uiWindowSetMargined(uiWindow *w, int margined);
+_UI_EXTERN int uiWindowResizeable(uiWindow *w);
+_UI_EXTERN void uiWindowSetResizeable(uiWindow *w, int resizeable);
 _UI_EXTERN uiWindow *uiNewWindow(const char *title, int width, int height, int hasMenubar);
 
 typedef struct uiButton uiButton;
diff --git a/unix/window.c b/unix/window.c
index c5ba2038..bfd86deb 100644
--- a/unix/window.c
+++ b/unix/window.c
@@ -19,6 +19,7 @@ struct uiWindow {
 
 	uiControl *child;
 	int margined;
+	int resizeable;
 
 	int (*onClosing)(uiWindow *, void *);
 	void *onClosingData;
@@ -229,6 +230,17 @@ void uiWindowSetMargined(uiWindow *w, int margined)
 	uiprivSetMargined(w->childHolderContainer, w->margined);
 }
 
+int uiWindowResizeable(uiWindow *w)
+{
+	return w->resizeable;
+}
+
+void uiWindowSetResizeable(uiWindow *w, int resizeable)
+{
+	w->resizeable = resizeable;
+	gtk_window_set_resizable(w->window, resizeable);
+}
+
 uiWindow *uiNewWindow(const char *title, int width, int height, int hasMenubar)
 {
 	uiWindow *w;
diff --git a/windows/window.cpp b/windows/window.cpp
index 2ea5b7ce..6fbb76f3 100644
--- a/windows/window.cpp
+++ b/windows/window.cpp
@@ -13,6 +13,7 @@ struct uiWindow {
 	int (*onClosing)(uiWindow *, void *);
 	void *onClosingData;
 	int margined;
+	int resizeable;
 	BOOL hasMenubar;
 	void (*onContentSizeChanged)(uiWindow *, void *);
 	void *onContentSizeChangedData;
@@ -428,6 +429,21 @@ void uiWindowSetMargined(uiWindow *w, int margined)
 	windowRelayout(w);
 }
 
+int uiWindowResizeable(uiWindow *w)
+{
+	return w->resizeable;
+}
+
+void uiWindowSetResizeable(uiWindow *w, int resizeable)
+{
+	w->resizeable = resizeable;
+	if (w->resizeable) {
+		setStyle(w->hwnd, getStyle(w->hwnd) | WS_THICKFRAME);
+	} else {
+		setStyle(w->hwnd, getStyle(w->hwnd) & ~WS_THICKFRAME);
+	}
+}
+
 // see http://blogs.msdn.com/b/oldnewthing/archive/2003/09/11/54885.aspx and http://blogs.msdn.com/b/oldnewthing/archive/2003/09/13/54917.aspx
 // TODO use clientSizeToWindowSize()
 static void setClientSize(uiWindow *w, int width, int height, BOOL hasMenubar, DWORD style, DWORD exstyle)