diff --git a/plugins/org.eclipse.dd.dsf.debug.ui/src/org/eclipse/dd/dsf/debug/internal/ui/disassembly/DisassemblyPart.java b/plugins/org.eclipse.dd.dsf.debug.ui/src/org/eclipse/dd/dsf/debug/internal/ui/disassembly/DisassemblyPart.java
index fef238139e6..be6ebf7818b 100644
--- a/plugins/org.eclipse.dd.dsf.debug.ui/src/org/eclipse/dd/dsf/debug/internal/ui/disassembly/DisassemblyPart.java
+++ b/plugins/org.eclipse.dd.dsf.debug.ui/src/org/eclipse/dd/dsf/debug/internal/ui/disassembly/DisassemblyPart.java
@@ -531,7 +531,7 @@ public abstract class DisassemblyPart extends WorkbenchPart implements IDisassem
 		fAnnotationPreferences = new MarkerAnnotationPreferences();
 		setPreferenceStore(new ChainedPreferenceStore(new IPreferenceStore[] {
 			DsfDebugUIPlugin.getDefault().getPreferenceStore(), EditorsUI.getPreferenceStore() }));
-		fPCAddress = fFrameAddress = PC_RUNNING;
+		fPCAddress = fFrameAddress = PC_UNKNOWN;
 		fTargetFrame = -1;
 		fBufferZone = 32;
 		fPCAnnotation = new DisassemblyIPAnnotation(true, 0);