diff --git a/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/internal/index/tests/IndexBindingResolutionBugs.java b/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/internal/index/tests/IndexBindingResolutionBugs.java
index 64bde4b66dc..843a6fa8b44 100644
--- a/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/internal/index/tests/IndexBindingResolutionBugs.java
+++ b/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/internal/index/tests/IndexBindingResolutionBugs.java
@@ -19,6 +19,7 @@ import org.eclipse.cdt.core.dom.ast.IBinding;
 import org.eclipse.cdt.core.dom.ast.IFunction;
 import org.eclipse.cdt.core.dom.ast.IScope;
 import org.eclipse.cdt.core.dom.ast.cpp.ICPPClassTemplate;
+import org.eclipse.cdt.core.dom.ast.cpp.ICPPField;
 import org.eclipse.cdt.core.dom.ast.cpp.ICPPNamespace;
 import org.eclipse.cdt.core.dom.ast.cpp.ICPPSpecialization;
 import org.eclipse.cdt.core.dom.ast.cpp.ICPPTemplateParameter;
@@ -222,4 +223,25 @@ public class IndexBindingResolutionBugs extends IndexBindingResolutionTestBase {
 		IBinding b0 = getBindingFromASTName("func1;", 5);
 		assertTrue(b0 instanceof IFunction);
 	}
+	
+	//	class B {
+	//  public:
+	//		class BB {
+	//		public:
+	//			int field;
+	//		};
+	//	};
+	//
+	//	class A : public B::BB {};
+	
+	//  #include "header.h"
+	//	
+	//  void foo() {
+	//		A c;
+	//		c.field;//comment
+	//	}
+	public void testBug183843() throws DOMException {
+		IBinding b0 = getBindingFromASTName("field;//", 5);
+		assertTrue(b0 instanceof ICPPField);
+	}
 }
diff --git a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/pdom/PDOM.java b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/pdom/PDOM.java
index 3953ffffd31..39d2b44b082 100644
--- a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/pdom/PDOM.java
+++ b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/pdom/PDOM.java
@@ -75,7 +75,7 @@ import org.eclipse.core.runtime.Status;
 public class PDOM extends PlatformObject implements IIndexFragment, IPDOM {
 	protected Database db;
 
-	public static final int VERSION = 33;
+	public static final int VERSION = 34;
 	// 0 - the beginning of it all
 	// 1 - first change to kick off upgrades
 	// 2 - added file inclusions
@@ -110,6 +110,7 @@ public class PDOM extends PlatformObject implements IIndexFragment, IPDOM {
 	// 31 - macros: added file locations
 	// 32 - support standalone function types (181936)
 	// 33 - templates: constructor instances
+	// 34 - fix for base classes represented by qualified names (183843)
 	
 	public static final int LINKAGES = Database.DATA_AREA;
 	public static final int FILE_INDEX = Database.DATA_AREA + 4;
diff --git a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/pdom/dom/cpp/PDOMCPPLinkage.java b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/pdom/dom/cpp/PDOMCPPLinkage.java
index 3a24ac9339b..d824f7fb177 100644
--- a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/pdom/dom/cpp/PDOMCPPLinkage.java
+++ b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/pdom/dom/cpp/PDOMCPPLinkage.java
@@ -117,7 +117,7 @@ class PDOMCPPLinkage extends PDOMLinkage {
 	public static final int CPP_CONSTRUCTOR_INSTANCE= PDOMLinkage.LAST_NODE_TYPE + 23;
 	public static final int CPP_DEFERRED_FUNCTION_INSTANCE= PDOMLinkage.LAST_NODE_TYPE + 24;
 	public static final int CPP_CLASS_INSTANCE= PDOMLinkage.LAST_NODE_TYPE + 25;
-	public static final int CPP_DEFERRED_CLASS_INSTANCE= PDOMCPPLinkage.LAST_NODE_TYPE + 26;
+	public static final int CPP_DEFERRED_CLASS_INSTANCE= PDOMLinkage.LAST_NODE_TYPE + 26;
 	public static final int CPP_PARAMETER_SPECIALIZATION= PDOMLinkage.LAST_NODE_TYPE + 27;
 	public static final int CPP_FIELD_SPECIALIZATION= PDOMLinkage.LAST_NODE_TYPE + 28;
 	public static final int CPP_FUNCTION_SPECIALIZATION= PDOMLinkage.LAST_NODE_TYPE + 29;
@@ -713,6 +713,14 @@ class PDOMCPPLinkage extends PDOMLinkage {
 		super.onCreateName(pdomName, name);
 		
 		IASTNode parentNode= name.getParent();
+		if (parentNode instanceof ICPPASTQualifiedName) {
+		    IASTName [] ns = ((ICPPASTQualifiedName)parentNode).getNames();
+		    if ( name != ns[ ns.length -1 ] ) {
+		    	return;
+		    } else {
+		    	parentNode = parentNode.getParent();
+		    }
+		}
 		if (parentNode instanceof ICPPASTBaseSpecifier) {
 			PDOMName derivedClassName= (PDOMName) pdomName.getEnclosingDefinition();
 			if (derivedClassName != null) {