diff --git a/debug/org.eclipse.cdt.debug.ui/ChangeLog b/debug/org.eclipse.cdt.debug.ui/ChangeLog
index ade723f386a..b57c1919df7 100644
--- a/debug/org.eclipse.cdt.debug.ui/ChangeLog
+++ b/debug/org.eclipse.cdt.debug.ui/ChangeLog
@@ -1,3 +1,8 @@
+2003-12-05 Mikhail Khodjaiants
+	'performApply' of 'SourceLookupBlock' should check if the project in configuration is the same as 
+	project saved in the block.
+	* SourceLookupBlock.java
+
 2003-12-04 Mikhail Khodjaiants
 	Changed the message displayed when the source file is not found.
 	* CDebugEditor.java
diff --git a/debug/org.eclipse.cdt.debug.ui/src/org/eclipse/cdt/debug/ui/sourcelookup/SourceLookupBlock.java b/debug/org.eclipse.cdt.debug.ui/src/org/eclipse/cdt/debug/ui/sourcelookup/SourceLookupBlock.java
index d6a87ff9f20..44b862bcea5 100644
--- a/debug/org.eclipse.cdt.debug.ui/src/org/eclipse/cdt/debug/ui/sourcelookup/SourceLookupBlock.java
+++ b/debug/org.eclipse.cdt.debug.ui/src/org/eclipse/cdt/debug/ui/sourcelookup/SourceLookupBlock.java
@@ -254,7 +254,7 @@ public class SourceLookupBlock implements Observer
 			if ( locator instanceof IAdaptable )
 			{
 				ICSourceLocator clocator = (ICSourceLocator)((IAdaptable)locator).getAdapter( ICSourceLocator.class );
-				if ( clocator != null )
+				if ( clocator != null && getProject() != null && getProject().equals( getProjectFromLaunchConfiguration( configuration ) ) )
 				{
 					clocator.setSourceLocations( getSourceLocations() );
 					clocator.setSearchForDuplicateFiles( searchForDuplicateFiles() );