diff --git a/plugins/platforms/x11/standalone/x11_output.h b/plugins/platforms/x11/standalone/x11_output.h
--- a/plugins/platforms/x11/standalone/x11_output.h
+++ b/plugins/platforms/x11/standalone/x11_output.h
@@ -51,7 +51,7 @@
     void setGeometry(QRect set);
 
     /**
-     * Current refresh rate in 1/ms.
+     * Current refresh rate in 1/μs = 1000/ms.
      */
     int refreshRate() const override;
     void setRefreshRate(int set);
diff --git a/plugins/platforms/x11/standalone/x11_platform.cpp b/plugins/platforms/x11/standalone/x11_platform.cpp
--- a/plugins/platforms/x11/standalone/x11_platform.cpp
+++ b/plugins/platforms/x11/standalone/x11_platform.cpp
@@ -528,7 +528,7 @@
             o->setCrtc(crtc);
             o->setGammaRampSize(gamma.isNull() ? 0 : gamma->size);
             o->setGeometry(geo);
-            o->setRefreshRate(refreshRate);
+            o->setRefreshRate(refreshRate * 1000);
 
             QString name;
             for (int j = 0; j < info->num_outputs; ++j) {