diff --git a/src/x11_monitor.c b/src/x11_monitor.c
index 5af8eebb..860fe1ea 100644
--- a/src/x11_monitor.c
+++ b/src/x11_monitor.c
@@ -446,6 +446,8 @@ _GLFWmonitor** _glfwPlatformGetMonitors(int* count)
         monitors = (_GLFWmonitor**) calloc(sr->noutput, sizeof(_GLFWmonitor*));
         if (!monitors)
         {
+            XRRFreeScreenResources(sr);
+
             _glfwSetError(GLFW_OUT_OF_MEMORY, NULL);
             return NULL;
         }