diff --git a/src/main/java/org/codelibs/fess/job/GenerateThumbnailJob.java b/src/main/java/org/codelibs/fess/job/GenerateThumbnailJob.java
index c99e1c1e1..d9aafa7e8 100644
--- a/src/main/java/org/codelibs/fess/job/GenerateThumbnailJob.java
+++ b/src/main/java/org/codelibs/fess/job/GenerateThumbnailJob.java
@@ -172,8 +172,8 @@ public class GenerateThumbnailJob extends ExecJob {
         if (logLevel != null) {
             cmdList.add("-Dfess.log.level=" + logLevel);
         }
-        stream(fessConfig.getJvmThumbnailOptions())
-                .of(stream -> stream.filter(StringUtil::isNotBlank).forEach(value -> cmdList.add(value)));
+        stream(fessConfig.getJvmThumbnailOptionsAsArray()).of(
+                stream -> stream.filter(StringUtil::isNotBlank).forEach(value -> cmdList.add(value)));
 
         File ownTmpDir = null;
         final String tmpDir = System.getProperty("java.io.tmpdir");
diff --git a/src/main/java/org/codelibs/fess/mylasta/direction/FessProp.java b/src/main/java/org/codelibs/fess/mylasta/direction/FessProp.java
index f77c83b2b..10c598f9a 100644
--- a/src/main/java/org/codelibs/fess/mylasta/direction/FessProp.java
+++ b/src/main/java/org/codelibs/fess/mylasta/direction/FessProp.java
@@ -681,6 +681,12 @@ public interface FessProp {
         return getJvmSuggestOptions().split("\n");
     }
 
+    String getJvmThumbnailOptions();
+
+    default String[] getJvmThumbnailOptionsAsArray() {
+        return getJvmThumbnailOptions().split("\n");
+    }
+
     String getCrawlerDocumentHtmlPrunedTags();
 
     default PrunedTag[] getCrawlerDocumentHtmlPrunedTagsAsArray() {