diff --git a/src/main/java/org/springframework/data/redis/connection/lettuce/LettuceReactiveStringCommands.java b/src/main/java/org/springframework/data/redis/connection/lettuce/LettuceReactiveStringCommands.java
index 6449c2a07..015e58fcb 100644
--- a/src/main/java/org/springframework/data/redis/connection/lettuce/LettuceReactiveStringCommands.java
+++ b/src/main/java/org/springframework/data/redis/connection/lettuce/LettuceReactiveStringCommands.java
@@ -37,6 +37,7 @@ import org.springframework.util.Assert;
 /**
  * @author Christoph Strobl
  * @author Mark Paluch
+ * @author Jiahe Cai
  * @since 2.0
  */
 class LettuceReactiveStringCommands implements ReactiveStringCommands {
@@ -93,7 +94,9 @@ class LettuceReactiveStringCommands implements ReactiveStringCommands {
 
 			Mono<String> mono = args != null ? cmd.set(command.getKey(), command.getValue(), args)
 					: cmd.set(command.getKey(), command.getValue());
-			return mono.map(LettuceConverters::stringToBoolean).map((value) -> new BooleanResponse<>(command, value));
+			return mono.map(LettuceConverters::stringToBoolean)
+					.map(value -> new BooleanResponse<>(command, value))
+					.switchIfEmpty(Mono.just(new BooleanResponse<>(command, Boolean.FALSE)));
 		}));
 	}
 
diff --git a/src/test/java/org/springframework/data/redis/core/DefaultReactiveValueOperationsIntegrationTests.java b/src/test/java/org/springframework/data/redis/core/DefaultReactiveValueOperationsIntegrationTests.java
index 463923de6..7d558e4a8 100644
--- a/src/test/java/org/springframework/data/redis/core/DefaultReactiveValueOperationsIntegrationTests.java
+++ b/src/test/java/org/springframework/data/redis/core/DefaultReactiveValueOperationsIntegrationTests.java
@@ -45,6 +45,7 @@ import org.springframework.data.redis.serializer.StringRedisSerializer;
  *
  * @author Mark Paluch
  * @author Christoph Strobl
+ * @author Jiahe Cai
  */
 @RunWith(Parameterized.class)
 @SuppressWarnings("unchecked")
@@ -131,7 +132,7 @@ public class DefaultReactiveValueOperationsIntegrationTests<K, V> {
 
 		StepVerifier.create(valueOperations.setIfAbsent(key, value)).expectNext(true).verifyComplete();
 
-		StepVerifier.create(valueOperations.setIfAbsent(key, value)).verifyComplete();
+		StepVerifier.create(valueOperations.setIfAbsent(key, value)).expectNext(false).verifyComplete();
 	}
 
 	@Test // DATAREDIS-602
@@ -141,7 +142,7 @@ public class DefaultReactiveValueOperationsIntegrationTests<K, V> {
 		V value = valueFactory.instance();
 		V laterValue = valueFactory.instance();
 
-		StepVerifier.create(valueOperations.setIfPresent(key, value)).verifyComplete();
+		StepVerifier.create(valueOperations.setIfPresent(key, value)).expectNext(false).verifyComplete();
 
 		StepVerifier.create(valueOperations.set(key, value)).expectNext(true).verifyComplete();