diff --git a/spring-beans/src/main/java/org/springframework/beans/factory/support/PropertiesBeanDefinitionReader.java b/spring-beans/src/main/java/org/springframework/beans/factory/support/PropertiesBeanDefinitionReader.java
index 02807b0311..0e7876f1ce 100644
--- a/spring-beans/src/main/java/org/springframework/beans/factory/support/PropertiesBeanDefinitionReader.java
+++ b/spring-beans/src/main/java/org/springframework/beans/factory/support/PropertiesBeanDefinitionReader.java
@@ -423,7 +423,7 @@ public class PropertiesBeanDefinitionReader extends AbstractBeanDefinitionReader
 		MutablePropertyValues pvs = new MutablePropertyValues();
 
 		String prefixWithSep = prefix + SEPARATOR;
-		int beginIndex = prefix.length() + SEPARATOR.length();
+		int beginIndex = prefixWithSep.length();
 
 		for (Map.Entry<?, ?> entry : map.entrySet()) {
 			String key = StringUtils.trimWhitespace((String) entry.getKey());