diff --git a/src/main/assemblies/files/fess.in.bat b/src/main/assemblies/files/fess.in.bat
index 39b5c8e73..104ff411a 100644
--- a/src/main/assemblies/files/fess.in.bat
+++ b/src/main/assemblies/files/fess.in.bat
@@ -84,9 +84,6 @@ set FESS_JAVA_OPTS=%FESS_JAVA_OPTS% -XX:+DisableExplicitGC
 REM Ensure UTF-8 encoding by default (e.g. filenames)
 set FESS_JAVA_OPTS=%FESS_JAVA_OPTS% -Dfile.encoding=UTF-8
 
-REM Use Groovy ClassValue
-set FESS_JAVA_OPTS=%FESS_JAVA_OPTS% -Dgroovy.use.classvalue=true
-
 REM Application Configuration
 set APP_NAME=fess
 set ES_HOME=%FESS_HOME%/es
diff --git a/src/main/assemblies/files/fess.in.sh b/src/main/assemblies/files/fess.in.sh
index c19c8e198..51da4506d 100755
--- a/src/main/assemblies/files/fess.in.sh
+++ b/src/main/assemblies/files/fess.in.sh
@@ -78,9 +78,6 @@ FESS_JAVA_OPTS="$FESS_JAVA_OPTS -XX:+DisableExplicitGC"
 # Ensure UTF-8 encoding by default (e.g. filenames)
 FESS_JAVA_OPTS="$FESS_JAVA_OPTS -Dfile.encoding=UTF-8"
 
-# Use Groovy ClassValue
-FESS_JAVA_OPTS="$FESS_JAVA_OPTS -Dgroovy.use.classvalue=true"
-
 # Application Configuration
 if [ "x$APP_NAME" = "x" ]; then
   APP_NAME=fess