diff --git a/spring-beans/src/main/java/org/springframework/beans/factory/config/YamlProcessor.java b/spring-beans/src/main/java/org/springframework/beans/factory/config/YamlProcessor.java
index 891e1bb937..4a8ac6351a 100644
--- a/spring-beans/src/main/java/org/springframework/beans/factory/config/YamlProcessor.java
+++ b/spring-beans/src/main/java/org/springframework/beans/factory/config/YamlProcessor.java
@@ -245,13 +245,7 @@ public abstract class YamlProcessor {
 			if (value instanceof Map) {
 				value = asMap(value);
 			}
-			if (key instanceof CharSequence) {
-				result.put(key.toString(), value);
-			}
-			else {
-				// It has to be a map key in this case
-				result.put("[" + key.toString() + "]", value);
-			}
+			result.put(key.toString(), value);
 		});
 		return result;
 	}
diff --git a/spring-beans/src/test/java/org/springframework/beans/factory/config/YamlMapFactoryBeanTests.java b/spring-beans/src/test/java/org/springframework/beans/factory/config/YamlMapFactoryBeanTests.java
index 1f9dcc7709..9a54593489 100644
--- a/spring-beans/src/test/java/org/springframework/beans/factory/config/YamlMapFactoryBeanTests.java
+++ b/spring-beans/src/test/java/org/springframework/beans/factory/config/YamlMapFactoryBeanTests.java
@@ -128,4 +128,18 @@ class YamlMapFactoryBeanTests {
 				this.factory.getObject().get("mymap"));
 	}
 
+	@Test
+	void testMapWithIntegerKey() {
+		this.factory.setResources(new ByteArrayResource("foo:\n  1: bar".getBytes()));
+		Map<String, Object> map = this.factory.getObject();
+
+		assertThat(map).hasSize(1);
+		assertThat(map.containsKey("foo")).isTrue();
+		Object object = map.get("foo");
+		assertThat(object).isInstanceOf(LinkedHashMap.class);
+		@SuppressWarnings("unchecked")
+		Map<String, Object> sub = (Map<String, Object>) object;
+		assertThat(sub.containsKey("1")).isTrue();
+		assertThat(sub.get("1")).isEqualTo("bar");
+	}
 }
diff --git a/spring-beans/src/test/java/org/springframework/beans/factory/config/YamlProcessorTests.java b/spring-beans/src/test/java/org/springframework/beans/factory/config/YamlProcessorTests.java
index 7a039b1142..e1fd98831e 100644
--- a/spring-beans/src/test/java/org/springframework/beans/factory/config/YamlProcessorTests.java
+++ b/spring-beans/src/test/java/org/springframework/beans/factory/config/YamlProcessorTests.java
@@ -99,7 +99,7 @@ class YamlProcessorTests {
 	void integerKeyBehaves() {
 		setYaml("foo: bar\n1: bar");
 		this.processor.process((properties, map) -> {
-			assertThat(properties.get("[1]")).isEqualTo("bar");
+			assertThat(properties.get("1")).isEqualTo("bar");
 			assertThat(properties).hasSize(2);
 		});
 	}
@@ -108,7 +108,7 @@ class YamlProcessorTests {
 	void integerDeepKeyBehaves() {
 		setYaml("foo:\n  1: bar");
 		this.processor.process((properties, map) -> {
-			assertThat(properties.get("foo[1]")).isEqualTo("bar");
+			assertThat(properties.get("foo.1")).isEqualTo("bar");
 			assertThat(properties).hasSize(1);
 		});
 	}
diff --git a/spring-beans/src/test/java/org/springframework/beans/factory/config/YamlPropertiesFactoryBeanTests.java b/spring-beans/src/test/java/org/springframework/beans/factory/config/YamlPropertiesFactoryBeanTests.java
index 8e9d5b19be..0331fc2ea8 100644
--- a/spring-beans/src/test/java/org/springframework/beans/factory/config/YamlPropertiesFactoryBeanTests.java
+++ b/spring-beans/src/test/java/org/springframework/beans/factory/config/YamlPropertiesFactoryBeanTests.java
@@ -180,7 +180,8 @@ class YamlPropertiesFactoryBeanTests {
 				new ByteArrayResource("indexed2:\n  - \"[a]\": foo\n    \"[b]\": bar".getBytes()),
 				new ByteArrayResource("only-left-bracket:\n  \"[/key1/\": foo".getBytes()),
 				new ByteArrayResource("only-right-bracket:\n  \"/key1/]\": foo".getBytes()),
-				new ByteArrayResource("special-bracket:\n  \"][/key1/][\": foo".getBytes()));
+				new ByteArrayResource("special-bracket:\n  \"][/key1/][\": foo".getBytes()),
+				new ByteArrayResource("number-key:\n  1: foo".getBytes()));
 
 		Properties properties = factory.getObject();
 		assertThat(properties.getProperty("root.webservices[[domain.test:8080]][0].username")).isEqualTo("foo");
@@ -195,6 +196,8 @@ class YamlPropertiesFactoryBeanTests {
 		assertThat(properties.getProperty("only-left-bracket[[/key1/]")).isEqualTo("foo");
 		assertThat(properties.getProperty("only-right-bracket[/key1/]]")).isEqualTo("foo");
 		assertThat(properties.getProperty("special-bracket.][/key1/][")).isEqualTo("foo");
+
+		assertThat(properties.getProperty("number-key.1")).isEqualTo("foo");
 	}