diff --git a/pom.xml b/pom.xml
index a4968ed..2009bf4 100644
--- a/pom.xml
+++ b/pom.xml
@@ -15,7 +15,7 @@
 	<parent>
 		<groupId>org.codelibs.fess</groupId>
 		<artifactId>fess-parent</artifactId>
-		<version>15.8.0-SNAPSHOT</version>
+		<version>15.8.0</version>
 		<relativePath />
 	</parent>
 	<build>
diff --git a/src/test/java/org/codelibs/fess/webapp/example/helper/CustomSystemHelperTest.java b/src/test/java/org/codelibs/fess/webapp/example/helper/CustomSystemHelperTest.java
index 1e07d5e..bbc6b24 100644
--- a/src/test/java/org/codelibs/fess/webapp/example/helper/CustomSystemHelperTest.java
+++ b/src/test/java/org/codelibs/fess/webapp/example/helper/CustomSystemHelperTest.java
@@ -70,6 +70,29 @@ public String getPathEncoding() {
             public String[] getSupportedLanguagesAsArray() {
                 return new String[] { "ja" };
             }
+
+            // SystemHelper#init() validates the four search-role prefixes, and a
+            // SimpleImpl built here has no properties behind it to read them from.
+            // Return the values fess_config.properties ships so the check passes.
+            @Override
+            public String getRoleSearchUserPrefix() {
+                return "1";
+            }
+
+            @Override
+            public String getRoleSearchGroupPrefix() {
+                return "2";
+            }
+
+            @Override
+            public String getRoleSearchRolePrefix() {
+                return "R";
+            }
+
+            @Override
+            public String getRoleSearchDeniedPrefix() {
+                return "D";
+            }
         });
         super.setUp(testInfo);
     }