diff --git a/dev-tools/eclipse/dot.settings/org.eclipse.jdt.core.prefs b/dev-tools/eclipse/dot.settings/org.eclipse.jdt.core.prefs
index 0dea4ea64a8..6f6533a8ad4 100644
--- a/dev-tools/eclipse/dot.settings/org.eclipse.jdt.core.prefs
+++ b/dev-tools/eclipse/dot.settings/org.eclipse.jdt.core.prefs
@@ -307,3 +307,4 @@ org.eclipse.jdt.core.formatter.wrap_outer_expressions_when_nested=true
 org.eclipse.jdt.core.compiler.problem.comparingIdentical=error
 org.eclipse.jdt.core.compiler.problem.noEffectAssignment=error
 org.eclipse.jdt.core.compiler.problem.unusedImport=error
+org.eclipse.jdt.core.compiler.problem.varargsArgumentNeedCast=error
diff --git a/lucene/tools/javadoc/ecj.javadocs.prefs b/lucene/tools/javadoc/ecj.javadocs.prefs
index c81d8e32aa3..61971ec6d1b 100644
--- a/lucene/tools/javadoc/ecj.javadocs.prefs
+++ b/lucene/tools/javadoc/ecj.javadocs.prefs
@@ -92,5 +92,5 @@ org.eclipse.jdt.core.compiler.problem.unusedParameterWhenImplementingAbstract=di
 org.eclipse.jdt.core.compiler.problem.unusedParameterWhenOverridingConcrete=disabled
 org.eclipse.jdt.core.compiler.problem.unusedPrivateMember=ignore
 org.eclipse.jdt.core.compiler.problem.unusedWarningToken=ignore
-org.eclipse.jdt.core.compiler.problem.varargsArgumentNeedCast=ignore
+org.eclipse.jdt.core.compiler.problem.varargsArgumentNeedCast=error
 org.eclipse.jdt.core.compiler.source=1.8