1 files changed, 3 insertions, 2 deletions
diff --git a/org.eclipse.jdt.core/model/org/eclipse/jdt/internal/core/ExternalFoldersManager.java b/org.eclipse.jdt.core/model/org/eclipse/jdt/internal/core/ExternalFoldersManager.java
index e2ccdb1446..e184a40337 100644
--- a/org.eclipse.jdt.core/model/org/eclipse/jdt/internal/core/ExternalFoldersManager.java
+++ b/org.eclipse.jdt.core/model/org/eclipse/jdt/internal/core/ExternalFoldersManager.java
@@ -146,12 +146,13 @@ public class ExternalFoldersManager {
 		if (externalPath == null || externalPath.isEmpty()) {
 			return false;
 		}
-		
+
 		JavaModelManager manager = JavaModelManager.getJavaModelManager();
 		if (manager.isExternalFile(externalPath) || manager.isAssumedExternalFile(externalPath)) {
 			return false;
 		}
-		if (!externalPath.isAbsolute() || (WINDOWS && externalPath.getDevice() == null)) {
+		if (!externalPath.isAbsolute()
+				|| (WINDOWS && (externalPath.getDevice() == null && !externalPath.isUNC()))) {
 			// can be only project relative path
 			return false;
 		}