diff --git a/src/org/ntlab/deltaExtractor/Alias.java b/src/org/ntlab/deltaExtractor/Alias.java
index 39edc86..054ecba 100644
--- a/src/org/ntlab/deltaExtractor/Alias.java
+++ b/src/org/ntlab/deltaExtractor/Alias.java
@@ -79,6 +79,8 @@
 			stTimeStamp = occurrencePoint.getMethodExecution().getExitTime();
 		} else if (aliasType == AliasType.METHOD_INVOCATION && st instanceof MethodInvocation) {
 			stTimeStamp = ((MethodInvocation) st).getCalledMethodExecution().getExitTime();
+		} else if (aliasType == AliasType.FORMAL_PARAMETER) {
+			stTimeStamp = occurrencePoint.getMethodExecution().getEntryTime();			
 		}
 		return stTimeStamp;
 	}