diff --git a/randr/rrcrtc.c b/randr/rrcrtc.c
index e82d050e3..6e2eca5ad 100644
--- a/randr/rrcrtc.c
+++ b/randr/rrcrtc.c
@@ -372,6 +372,11 @@ RRCrtcDetachScanoutPixmap(RRCrtcPtr crtc)
     ret = pScrPriv->rrCrtcSetScanoutPixmap(crtc, NULL);
     if (crtc->scanout_pixmap) {
         master->StopPixmapTracking(mscreenpix, crtc->scanout_pixmap);
+        /*
+         * Unref the pixmap twice: once for the original reference, and once
+         * for the reference implicitly added by PixmapShareToSlave.
+         */
+        master->DestroyPixmap(crtc->scanout_pixmap->master_pixmap);
         master->DestroyPixmap(crtc->scanout_pixmap->master_pixmap);
         crtc->pScreen->DestroyPixmap(crtc->scanout_pixmap);
     }