diff --git a/src/gui.c b/src/gui.c
index d7024a8..a4e2bfe 100644
--- a/src/gui.c
+++ b/src/gui.c
@@ -1407,7 +1407,7 @@
     if (!gui.shell_created)
 	return;
 
-#ifdef MSWIN
+#if defined(MSWIN) || defined(FEAT_GUI_GTK)
     /* If not setting to a user specified size and maximized, calculate the
      * number of characters that fit in the maximized window. */
     if (!mustset && gui_mch_maximized())
diff --git a/src/gui_gtk_x11.c b/src/gui_gtk_x11.c
index 9d95f1a..e2f9fc5 100644
--- a/src/gui_gtk_x11.c
+++ b/src/gui_gtk_x11.c
@@ -3900,6 +3900,21 @@
 }
 
 /*
+ * Called when the font changed while the window is maximized.  Compute the
+ * new Rows and Columns.  This is like resizing the window.
+ */
+    void
+gui_mch_newfont()
+{
+    int w, h;
+
+    gtk_window_get_size(GTK_WINDOW(gui.mainwin), &w, &h);
+    w -= get_menu_tool_width();
+    h -= get_menu_tool_height();
+    gui_resize_shell(w, h);
+}
+
+/*
  * Set the windows size.
  */
     void
@@ -4409,14 +4424,9 @@
 
     if (gui_mch_maximized())
     {
-	int w, h;
-
 	/* Update lines and columns in accordance with the new font, keep the
 	 * window maximized. */
-	gtk_window_get_size(GTK_WINDOW(gui.mainwin), &w, &h);
-	w -= get_menu_tool_width();
-	h -= get_menu_tool_height();
-	gui_resize_shell(w, h);
+	gui_mch_newfont();
     }
     else
     {
diff --git a/src/proto/gui_gtk_x11.pro b/src/proto/gui_gtk_x11.pro
index 2484082..e395a0c 100644
--- a/src/proto/gui_gtk_x11.pro
+++ b/src/proto/gui_gtk_x11.pro
@@ -20,6 +20,7 @@
 void gui_mch_set_winpos __ARGS((int x, int y));
 int gui_mch_maximized __ARGS((void));
 void gui_mch_unmaximize __ARGS((void));
+void gui_mch_newfont __ARGS((void));
 void gui_mch_set_shellsize __ARGS((int width, int height, int min_width, int min_height, int base_width, int base_height, int direction));
 void gui_mch_get_screen_dimensions __ARGS((int *screen_w, int *screen_h));
 void gui_mch_settitle __ARGS((char_u *title, char_u *icon));
diff --git a/src/version.c b/src/version.c
index e009b85..8ef4fac 100644
--- a/src/version.c
+++ b/src/version.c
@@ -710,6 +710,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    279,
+/**/
     278,
 /**/
     277,