diff --git a/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/r2dbc/ConnectionFactoryBuilder.java b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/r2dbc/ConnectionFactoryBuilder.java
index bf6ff65b756..4642747f572 100644
--- a/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/r2dbc/ConnectionFactoryBuilder.java
+++ b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/r2dbc/ConnectionFactoryBuilder.java
@@ -244,6 +244,8 @@ public final class ConnectionFactoryBuilder {
 					.to(builder::maxIdleTime);
 			map.from(options.getValue(PoolingConnectionFactoryProvider.MAX_CREATE_CONNECTION_TIME)).as(this::toDuration)
 					.to(builder::maxCreateConnectionTime);
+			map.from(options.getValue(PoolingConnectionFactoryProvider.MIN_IDLE)).as(this::toInteger)
+					.to(builder::minIdle);
 			map.from(options.getValue(PoolingConnectionFactoryProvider.POOL_NAME)).as(this::toString).to(builder::name);
 			map.from(options.getValue(PoolingConnectionFactoryProvider.PRE_RELEASE)).to((function) -> builder
 					.preRelease((Function<? super Connection, ? extends Publisher<Void>>) function));
diff --git a/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/r2dbc/ConnectionFactoryBuilderTests.java b/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/r2dbc/ConnectionFactoryBuilderTests.java
index 56638d1e15a..342becab8fe 100644
--- a/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/r2dbc/ConnectionFactoryBuilderTests.java
+++ b/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/r2dbc/ConnectionFactoryBuilderTests.java
@@ -265,7 +265,7 @@ class ConnectionFactoryBuilderTests {
 		MAX_CREATE_CONNECTION_TIME(PoolingConnectionFactoryProvider.MAX_CREATE_CONNECTION_TIME, Duration.ofSeconds(10),
 				"maxCreateConnectionTime"),
 
-		MIN_IDLE(PoolingConnectionFactoryProvider.MIN_IDLE, 0, "minIdle"),
+		MIN_IDLE(PoolingConnectionFactoryProvider.MIN_IDLE, 5, "minIdle"),
 
 		POOL_NAME(PoolingConnectionFactoryProvider.POOL_NAME, "testPool", "name"),