diff --git a/odm/src/main/java/org/springframework/ldap/odm/tools/SchemaToJava.java b/odm/src/main/java/org/springframework/ldap/odm/tools/SchemaToJava.java
index e128a8d0..cc9f2d2d 100755
--- a/odm/src/main/java/org/springframework/ldap/odm/tools/SchemaToJava.java
+++ b/odm/src/main/java/org/springframework/ldap/odm/tools/SchemaToJava.java
@@ -411,7 +411,7 @@ public final class SchemaToJava {
 		}
 
 		// Look for the optional syntax to Java class mapping file
-		String syntaxMapFileName = cmd.getOptionValue(Flag.SYNTAX_MAP.getShort(), null);
+		String syntaxMapFileName = cmd.getOptionValue(Flag.SYNTAX_MAP.getShort(), (String) null);
 		SyntaxToJavaClass syntaxToJavaClass = new SyntaxToJavaClass(new HashMap<>());
 		if (syntaxMapFileName != null) {
 			File syntaxMapFile = new File(syntaxMapFileName);