diff --git a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/language/settings/providers/ScannerDiscoveryLegacySupport.java b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/language/settings/providers/ScannerDiscoveryLegacySupport.java
index 0b3f7482b13..53f77ee6fc3 100644
--- a/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/language/settings/providers/ScannerDiscoveryLegacySupport.java
+++ b/core/org.eclipse.cdt.core/model/org/eclipse/cdt/core/language/settings/providers/ScannerDiscoveryLegacySupport.java
@@ -112,7 +112,7 @@ public class ScannerDiscoveryLegacySupport {
 				project = prjDescription.getProject();
 			}
 		}
-		return isLanguageSettingsProvidersFunctionalityEnabled(project) || isMbsLanguageSettingsProviderOn(cfgDescription);
+		return !isLanguageSettingsProvidersFunctionalityEnabled(project) || isMbsLanguageSettingsProviderOn(cfgDescription);
 	}
 
 	/**
@@ -125,9 +125,9 @@ public class ScannerDiscoveryLegacySupport {
 		if (prjDescription != null) {
 			cfgDescription = prjDescription.getActiveConfiguration();
 		}
-		return isLanguageSettingsProvidersFunctionalityEnabled(project) || isMbsLanguageSettingsProviderOn(cfgDescription);
+		return !isLanguageSettingsProvidersFunctionalityEnabled(project) || isMbsLanguageSettingsProviderOn(cfgDescription);
 	}
-	
+
 	/**
 	 * Return list containing MBS and User provider. Used to initialize for unaware tool-chains (backward compatibility).
 	 */