diff --git a/README.md b/README.md
index 3fce2f8c2..5c31fb600 100644
--- a/README.md
+++ b/README.md
@@ -118,7 +118,7 @@ information on what to include when reporting a bug.
 
 ## Changelog
 
-User-visible changes since the last release.
+- [X11] Bugfix: Simultanous key presses were being ignored (#1112)
 
 
 ## Contact
diff --git a/src/x11_window.c b/src/x11_window.c
index 1b3f403fc..9feecdc82 100644
--- a/src/x11_window.c
+++ b/src/x11_window.c
@@ -1258,7 +1258,8 @@ static void processEvent(XEvent *event)
                 //       These have the same timestamp as the original event
                 //       Corresponding release events are filtered out
                 //       implicitly by the GLFW key repeat logic
-                if (window->x11.lastKeyTime < event->xkey.time)
+                if (window->x11.lastKeyTime < event->xkey.time ||
+                    (key != GLFW_KEY_UNKNOWN && window->keys[key] != GLFW_PRESS))
                 {
                     if (keycode)
                         _glfwInputKey(window, key, keycode, GLFW_PRESS, mods);