diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/language/settings/providers/LanguageSettingsScannerInfoProvider.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/language/settings/providers/LanguageSettingsScannerInfoProvider.java
index d54236e7e83..a52272cfb89 100644
--- a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/language/settings/providers/LanguageSettingsScannerInfoProvider.java
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/language/settings/providers/LanguageSettingsScannerInfoProvider.java
@@ -202,7 +202,7 @@ public class LanguageSettingsScannerInfoProvider implements IScannerInfoProvider
 		}
 
 		IPath locPath = new Path(location);
-		if (locPath.isAbsolute() && locPath.getDevice() == null) {
+		if (!locPath.isUNC() && locPath.isAbsolute() && locPath.getDevice() == null) {
 			IPath buildCWD = getBuildCWD(cfgDescription);
 			// prepend device (C:) for Windows
 			String device = buildCWD.getDevice();