diff --git a/guacamole-common/src/test/java/org/glyptodon/guacamole/protocol/FilteredGuacamoleReaderTest.java b/guacamole-common/src/test/java/org/glyptodon/guacamole/protocol/FilteredGuacamoleReaderTest.java
index a03b65e07..40d6e0305 100644
--- a/guacamole-common/src/test/java/org/glyptodon/guacamole/protocol/FilteredGuacamoleReaderTest.java
+++ b/guacamole-common/src/test/java/org/glyptodon/guacamole/protocol/FilteredGuacamoleReaderTest.java
@@ -40,7 +40,7 @@ public class FilteredGuacamoleReaderTest {
     /**
      * Filter which allows through "yes" instructions but drops all others.
      */
-    private class TestFilter implements GuacamoleFilter {
+    private static class TestFilter implements GuacamoleFilter {
 
         @Override
         public GuacamoleInstruction filter(GuacamoleInstruction instruction) throws GuacamoleException {
diff --git a/guacamole-common/src/test/java/org/glyptodon/guacamole/protocol/FilteredGuacamoleWriterTest.java b/guacamole-common/src/test/java/org/glyptodon/guacamole/protocol/FilteredGuacamoleWriterTest.java
index c47a75624..4e7bd7d2d 100644
--- a/guacamole-common/src/test/java/org/glyptodon/guacamole/protocol/FilteredGuacamoleWriterTest.java
+++ b/guacamole-common/src/test/java/org/glyptodon/guacamole/protocol/FilteredGuacamoleWriterTest.java
@@ -40,7 +40,7 @@ public class FilteredGuacamoleWriterTest {
     /**
      * Filter which allows through "yes" instructions but drops all others.
      */
-    private class TestFilter implements GuacamoleFilter {
+    private static class TestFilter implements GuacamoleFilter {
 
         @Override
         public GuacamoleInstruction filter(GuacamoleInstruction instruction) throws GuacamoleException {