diff --git a/jsoncdb/org.eclipse.cdt.jsoncdb.core/src/org/eclipse/cdt/jsoncdb/core/internal/ParserDetection.java b/jsoncdb/org.eclipse.cdt.jsoncdb.core/src/org/eclipse/cdt/jsoncdb/core/internal/ParserDetection.java
index 7b7af5d2037..87326fa2fad 100644
--- a/jsoncdb/org.eclipse.cdt.jsoncdb.core/src/org/eclipse/cdt/jsoncdb/core/internal/ParserDetection.java
+++ b/jsoncdb/org.eclipse.cdt.jsoncdb.core/src/org/eclipse/cdt/jsoncdb/core/internal/ParserDetection.java
@@ -55,7 +55,7 @@ public final class ParserDetection {
 	 */
 	private static List<IToolDetectionParticipant> parserDetectors;
 
-	static void init() {
+	private static synchronized void init() {
 		if (parserDetectors == null) {
 			parserDetectors = new ArrayList<>(22);