diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CConfigurationSpecSettings.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CConfigurationSpecSettings.java
index 7b0dc6c2740..73c58f3aa0a 100644
--- a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CConfigurationSpecSettings.java
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/internal/core/settings/model/CConfigurationSpecSettings.java
@@ -450,6 +450,12 @@ public class CConfigurationSpecSettings implements ICSettingsStorage{
 		if(fIsModified)
 			return true;
 		
+		if(fMacros != null && fMacros.isDirty())
+			return true;
+		
+		if(fEnvironment != null && fEnvironment.isDirty())
+			return true;
+		
 		return fExtSettingsProvider.isModified();
 	}