--- a/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/FieldWriterImpl.java	Wed Apr 24 10:20:25 2019 -0400
+++ b/src/jdk.javadoc/share/classes/jdk/javadoc/internal/doclets/formats/html/FieldWriterImpl.java	Wed Apr 24 11:26:44 2019 -0700
@@ -33,6 +33,7 @@
 import javax.lang.model.element.VariableElement;
 
 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;
@@ -248,7 +249,7 @@
         }
         Content labelHeading = HtmlTree.HEADING(Headings.TypeDeclaration.INHERITED_SUMMARY_HEADING,
                 label);
-        labelHeading.add(Contents.SPACE);
+        labelHeading.add(Entity.NO_BREAK_SPACE);
         labelHeading.add(classLink);
         inheritedTree.add(labelHeading);
     }