diff --git a/src/render/Renderer.cpp b/src/render/Renderer.cpp
index 3ea40df4..fa0ff00b 100644
--- a/src/render/Renderer.cpp
+++ b/src/render/Renderer.cpp
@@ -982,6 +982,9 @@ bool CHyprRenderer::applyMonitorRule(CMonitor* pMonitor, SMonitorRule* pMonitorR
                     Debug::log(LOG, "Set a custom mode %ix%i@%2f (mode not found in monitor modes)", (int)pMonitorRule->resolution.x, (int)pMonitorRule->resolution.y, (float)pMonitorRule->refreshRate);
                 }
             } else {
+                wlr_output_set_custom_mode(pMonitor->output, (int)pMonitorRule->resolution.x, (int)pMonitorRule->resolution.y, (int)pMonitorRule->refreshRate * 1000);
+                pMonitor->vecSize = pMonitorRule->resolution;
+
                 Debug::log(LOG, "Setting custom mode for %s", pMonitor->output->name);
             }
         }