diff --git a/src/main/java/org/springframework/data/redis/connection/srp/SrpUtils.java b/src/main/java/org/springframework/data/redis/connection/srp/SrpUtils.java
index 4adfebb4a..f3b50d16a 100644
--- a/src/main/java/org/springframework/data/redis/connection/srp/SrpUtils.java
+++ b/src/main/java/org/springframework/data/redis/connection/srp/SrpUtils.java
@@ -245,7 +245,8 @@ abstract class SrpUtils {
 				arrays.add(params.getOrder().name().getBytes(Charsets.UTF_8));
 			}
 
-			if (params.isAlphabetic()) {
+			Boolean isAlpha = params.isAlphabetic();
+			if (isAlpha != null && isAlpha) {
 				arrays.add(ALPHA);
 			}