diff --git a/features/org.eclipse.equinox.core.sdk/forceQualifierUpdate.txt b/features/org.eclipse.equinox.core.sdk/forceQualifierUpdate.txt
index e2633a0..17bfc76 100644
--- a/features/org.eclipse.equinox.core.sdk/forceQualifierUpdate.txt
+++ b/features/org.eclipse.equinox.core.sdk/forceQualifierUpdate.txt
@@ -9,4 +9,5 @@
 Bug 553238 - Unanticipated comparator errors in I20191119-1800
 Bug 568593 - Use latest slf4j from Orbit
 Bug 571080 - Update to Sshd osgi 2.6.0
-Build failure on 20210324
\ No newline at end of file
+Build failure on 20210324
+Bug 572853 - Comparator errors in 4.20 I20210414-1800 build
\ No newline at end of file