diff --git a/dspace-api/src/main/java/org/dspace/app/mediafilter/XPDF2Thumbnail.java b/dspace-api/src/main/java/org/dspace/app/mediafilter/XPDF2Thumbnail.java
index 566dcd7b27..32e5a02aa2 100644
--- a/dspace-api/src/main/java/org/dspace/app/mediafilter/XPDF2Thumbnail.java
+++ b/dspace-api/src/main/java/org/dspace/app/mediafilter/XPDF2Thumbnail.java
@@ -122,7 +122,7 @@ public class XPDF2Thumbnail extends MediaFilter
     private int maxwidth = 0;
 
     // backup default for size, on the large side.
-    final private int DEFAULT_MAXWIDTH = 500;
+    private static final int DEFAULT_MAXWIDTH = 500;
 
     public String getFilteredName(String oldFilename)
     {
diff --git a/dspace-api/src/main/java/org/dspace/content/crosswalk/XHTMLHeadDisseminationCrosswalk.java b/dspace-api/src/main/java/org/dspace/content/crosswalk/XHTMLHeadDisseminationCrosswalk.java
index 3e57c58ba0..859e65e9d7 100644
--- a/dspace-api/src/main/java/org/dspace/content/crosswalk/XHTMLHeadDisseminationCrosswalk.java
+++ b/dspace-api/src/main/java/org/dspace/content/crosswalk/XHTMLHeadDisseminationCrosswalk.java
@@ -96,7 +96,7 @@ public class XHTMLHeadDisseminationCrosswalk extends SelfNamedPlugin implements
             + "crosswalks"
             + File.separator + "xhtml-head-item.properties";
 
-    private final String XHTML_NAMESPACE = "http://www.w3.org/1999/xhtml";
+    private final static String XHTML_NAMESPACE = "http://www.w3.org/1999/xhtml";
 
     /**
      * Maps DSpace metadata field to name to use in XHTML head element, e.g.