diff --git a/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/ast2/AST2Tests.java b/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/ast2/AST2Tests.java
index 52d823202e6..8502e818671 100644
--- a/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/ast2/AST2Tests.java
+++ b/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/ast2/AST2Tests.java
@@ -2941,4 +2941,15 @@ public class AST2Tests extends AST2BaseTest {
                 ICPPASTCastExpression.op_dynamic_cast);
 
     }
+    
+    public void testBug86766() throws Exception {
+        IASTTranslationUnit tu = parse("char foo; void foo(){}", ParserLanguage.C); //$NON-NLS-1$
+        CNameCollector col = new CNameCollector();
+        tu.getVisitor().visitTranslationUnit( col);
+        
+        IVariable foo = (IVariable) col.getName(0).resolveBinding();
+        IProblemBinding prob = (IProblemBinding) col.getName(1).resolveBinding();
+        assertEquals( prob.getID(), IProblemBinding.SEMANTIC_INVALID_OVERLOAD );
+        assertNotNull( foo );
+    }
 }
\ No newline at end of file
diff --git a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/c/CVisitor.java b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/c/CVisitor.java
index f2c2faeabb3..37696689bb6 100644
--- a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/c/CVisitor.java
+++ b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/c/CVisitor.java
@@ -640,7 +640,10 @@ public class CVisitor implements ICASTVisitor {
 		if( declarator instanceof IASTStandardFunctionDeclarator ){
 			binding = resolveBinding( parent, CURRENT_SCOPE );
 			if( binding != null ) {
-			    ((CFunction)binding).addDeclarator( (IASTStandardFunctionDeclarator) declarator );
+			    if( binding instanceof IFunction )
+			        ((CFunction)binding).addDeclarator( (IASTStandardFunctionDeclarator) declarator );
+			    else 
+			        binding = new ProblemBinding( IProblemBinding.SEMANTIC_INVALID_OVERLOAD, name.toCharArray() );
 			} else {
 				binding = createBinding(declarator);
 			}
@@ -648,7 +651,10 @@ public class CVisitor implements ICASTVisitor {
 			if ( CharArrayUtils.equals(declarator.getName().toCharArray(), name.toCharArray()) ){
 				binding = resolveBinding( parent, CURRENT_SCOPE );
 				if( binding != null ) {
-				    ((CFunction)binding).addDeclarator( (ICASTKnRFunctionDeclarator) declarator );
+				    if( binding instanceof IFunction )
+				        ((CFunction)binding).addDeclarator( (ICASTKnRFunctionDeclarator) declarator );
+				    else 
+				        binding = new ProblemBinding( IProblemBinding.SEMANTIC_INVALID_OVERLOAD, name.toCharArray() );
 				} else { 
 					binding = createBinding(declarator);
 				}