diff --git a/codan/org.eclipse.cdt.codan.core.cxx/src/org/eclipse/cdt/codan/core/cxx/internal/model/CxxCodanReconciler.java b/codan/org.eclipse.cdt.codan.core.cxx/src/org/eclipse/cdt/codan/core/cxx/internal/model/CxxCodanReconciler.java
index 5e7aa110294..f823169c573 100644
--- a/codan/org.eclipse.cdt.codan.core.cxx/src/org/eclipse/cdt/codan/core/cxx/internal/model/CxxCodanReconciler.java
+++ b/codan/org.eclipse.cdt.codan.core.cxx/src/org/eclipse/cdt/codan/core/cxx/internal/model/CxxCodanReconciler.java
@@ -12,8 +12,12 @@ package org.eclipse.cdt.codan.core.cxx.internal.model;
 
 import org.eclipse.cdt.codan.core.CodanRuntime;
 import org.eclipse.cdt.codan.internal.core.CodanBuilder;
+import org.eclipse.cdt.core.CCProjectNature;
+import org.eclipse.cdt.core.CProjectNature;
 import org.eclipse.cdt.core.dom.ast.IASTTranslationUnit;
+import org.eclipse.core.resources.IProject;
 import org.eclipse.core.resources.IResource;
+import org.eclipse.core.runtime.CoreException;
 import org.eclipse.core.runtime.IProgressMonitor;
 
 /**
@@ -21,12 +25,23 @@ import org.eclipse.core.runtime.IProgressMonitor;
  * 
  */
 public class CxxCodanReconciler {
-	private CodanBuilder builder = (CodanBuilder) CodanRuntime.getInstance().getBuilder();
+	private CodanBuilder builder = (CodanBuilder) CodanRuntime.getInstance()
+			.getBuilder();
 
 	public void reconciledAst(IASTTranslationUnit ast, IResource resource,
 			IProgressMonitor monitor) {
 		if (ast == null)
 			return;
-		builder.runInEditor(ast, resource, monitor);
+		IProject project = resource.getProject();
+		if (project==null) return;
+		try {
+			if (project.hasNature(CProjectNature.C_NATURE_ID)
+					|| project.hasNature(CCProjectNature.CC_NATURE_ID)) {
+				builder.runInEditor(ast, resource, monitor);
+			}
+		} catch (CoreException e) {
+			// ignore
+		}
+		
 	}
 }