diff --git a/dependency-check-core/src/main/java/org/owasp/dependencycheck/Engine.java b/dependency-check-core/src/main/java/org/owasp/dependencycheck/Engine.java
index c35a796e0..675eee417 100644
--- a/dependency-check-core/src/main/java/org/owasp/dependencycheck/Engine.java
+++ b/dependency-check-core/src/main/java/org/owasp/dependencycheck/Engine.java
@@ -61,12 +61,12 @@ public class Engine implements FileFilter {
     /**
      * A Map of analyzers grouped by Analysis phase.
      */
-    private Map<AnalysisPhase, List<Analyzer>> analyzers = new EnumMap<AnalysisPhase, List<Analyzer>>(AnalysisPhase.class);
+    private final Map<AnalysisPhase, List<Analyzer>> analyzers = new EnumMap<AnalysisPhase, List<Analyzer>>(AnalysisPhase.class);
 
     /**
      * A Map of analyzers grouped by Analysis phase.
      */
-    private Set<FileTypeAnalyzer> fileTypeAnalyzers = new HashSet<FileTypeAnalyzer>();
+    private final Set<FileTypeAnalyzer> fileTypeAnalyzers = new HashSet<FileTypeAnalyzer>();
 
     /**
      * The ClassLoader to use when dynamically loading Analyzer and Update services.