diff --git a/spring-boot-project/spring-boot-tools/spring-boot-configuration-processor/src/main/java/org/springframework/boot/configurationprocessor/TypeUtils.java b/spring-boot-project/spring-boot-tools/spring-boot-configuration-processor/src/main/java/org/springframework/boot/configurationprocessor/TypeUtils.java
index a3be2fd1c6..f883b53887 100644
--- a/spring-boot-project/spring-boot-tools/spring-boot-configuration-processor/src/main/java/org/springframework/boot/configurationprocessor/TypeUtils.java
+++ b/spring-boot-project/spring-boot-tools/spring-boot-configuration-processor/src/main/java/org/springframework/boot/configurationprocessor/TypeUtils.java
@@ -19,7 +19,9 @@ package org.springframework.boot.configurationprocessor;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
+import java.util.stream.Collectors;
 
 import javax.annotation.processing.ProcessingEnvironment;
 import javax.lang.model.element.Element;
@@ -185,7 +187,14 @@ class TypeUtils {
 				return getQualifiedName(enclosingElement) + "$"
 						+ type.asElement().getSimpleName().toString();
 			}
-			return type.toString();
+			StringBuilder sb  = new StringBuilder();
+			sb.append(getQualifiedName(type.asElement()));
+			if (!type.getTypeArguments().isEmpty()) {
+				List<String> parameters = type.getTypeArguments().stream()
+						.map(TypeMirror::toString).collect(Collectors.toList());
+				sb.append("<").append(String.join(",", parameters)).append(">");
+			}
+			return sb.toString();
 		}
 
 		@Override
diff --git a/spring-boot-project/spring-boot-tools/spring-boot-configuration-processor/src/test/java/org/springframework/boot/configurationprocessor/ConfigurationMetadataAnnotationProcessorTests.java b/spring-boot-project/spring-boot-tools/spring-boot-configuration-processor/src/test/java/org/springframework/boot/configurationprocessor/ConfigurationMetadataAnnotationProcessorTests.java
index 87af4e0e6a..394e0fbf60 100644
--- a/spring-boot-project/spring-boot-tools/spring-boot-configuration-processor/src/test/java/org/springframework/boot/configurationprocessor/ConfigurationMetadataAnnotationProcessorTests.java
+++ b/spring-boot-project/spring-boot-tools/spring-boot-configuration-processor/src/test/java/org/springframework/boot/configurationprocessor/ConfigurationMetadataAnnotationProcessorTests.java
@@ -267,6 +267,8 @@ public class ConfigurationMetadataAnnotationProcessorTests {
 				"java.util.Collection<java.lang.Byte>"));
 		assertThat(metadata).has(Metadata.withProperty("collection.doubles",
 				"java.util.List<java.lang.Double>"));
+		assertThat(metadata).has(Metadata.withProperty("collection.names-to-holders",
+				"java.util.Map<java.lang.String,org.springframework.boot.configurationsample.simple.SimpleCollectionProperties.Holder<java.lang.String>>"));
 	}
 
 	@Test
diff --git a/spring-boot-project/spring-boot-tools/spring-boot-configuration-processor/src/test/java/org/springframework/boot/configurationsample/simple/SimpleCollectionProperties.java b/spring-boot-project/spring-boot-tools/spring-boot-configuration-processor/src/test/java/org/springframework/boot/configurationsample/simple/SimpleCollectionProperties.java
index e8c627f712..5e75e92211 100644
--- a/spring-boot-project/spring-boot-tools/spring-boot-configuration-processor/src/test/java/org/springframework/boot/configurationsample/simple/SimpleCollectionProperties.java
+++ b/spring-boot-project/spring-boot-tools/spring-boot-configuration-processor/src/test/java/org/springframework/boot/configurationsample/simple/SimpleCollectionProperties.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2017 the original author or authors.
+ * Copyright 2012-2018 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -45,6 +45,8 @@ public class SimpleCollectionProperties {
 
 	private final List<Double> doubles = new ArrayList<>();
 
+	private final Map<String, Holder<String>> namesToHolders = new HashMap<>();
+
 	public Map<Integer, String> getIntegersToNames() {
 		return this.integersToNames;
 	}
@@ -81,4 +83,18 @@ public class SimpleCollectionProperties {
 		return this.doubles;
 	}
 
+	public Map<String, Holder<String>> getNamesToHolders() {
+		return this.namesToHolders;
+	}
+
+	public static class Holder<T> {
+
+		private T target;
+
+		public void setTarget(T target) {
+			this.target = target;
+		}
+
+	}
+
 }