--- a/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/AnnotationTypeRequiredMemberWriterImpl.java	Wed Apr 24 10:20:25 2019 -0400
+++ b/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/AnnotationTypeRequiredMemberWriterImpl.java	Wed Apr 24 11:26:44 2019 -0700
@@ -31,6 +31,7 @@
 import javax.lang.model.type.TypeMirror;
 
 import jdk.javadoc.internal.doclets.formats.html.markup.ContentBuilder;
+import jdk.javadoc.internal.doclets.formats.html.markup.Entity;
 import jdk.javadoc.internal.doclets.formats.html.markup.HtmlStyle;
 import jdk.javadoc.internal.doclets.formats.html.markup.HtmlTag;
 import jdk.javadoc.internal.doclets.formats.html.markup.HtmlTree;
@@ -142,7 +143,7 @@
                 writer.getLink(new LinkInfoImpl(configuration,
                         LinkInfoImpl.Kind.MEMBER, getType(member)));
         pre.add(link);
-        pre.add(Contents.SPACE);
+        pre.add(Entity.NO_BREAK_SPACE);
         if (configuration.linksource) {
             Content memberName = new StringContent(name(member));
             writer.addSrcLink(member, memberName, pre);