diff --git a/spring-binding/src/main/java/org/springframework/binding/convert/ConversionExecutor.java b/spring-binding/src/main/java/org/springframework/binding/convert/ConversionExecutor.java
index f8de988e..a6041b4d 100644
--- a/spring-binding/src/main/java/org/springframework/binding/convert/ConversionExecutor.java
+++ b/spring-binding/src/main/java/org/springframework/binding/convert/ConversionExecutor.java
@@ -104,7 +104,7 @@ public class ConversionExecutor {
 		}
 		if (source != null && !getSourceClass().isInstance(source)) {
 			throw new ConversionException(getSourceClass(), source, getTargetClass(),
-					"Source object '" + source +  "' is expected to be a " + getSourceClass());
+					"Source object '" + source +  "' is expected to be an instance of " + getSourceClass());
 		}
 		return converter.convert(source, targetClass, context);
 	}
diff --git a/spring-binding/src/test/java/org/springframework/binding/convert/ConversionExecutorTests.java b/spring-binding/src/test/java/org/springframework/binding/convert/ConversionExecutorTests.java
index f6bfc89f..7d9c2d3a 100644
--- a/spring-binding/src/test/java/org/springframework/binding/convert/ConversionExecutorTests.java
+++ b/spring-binding/src/test/java/org/springframework/binding/convert/ConversionExecutorTests.java
@@ -70,4 +70,4 @@ public class ConversionExecutorTests extends TestCase {
 		}
 	}
 
-}
+}
\ No newline at end of file