diff --git a/src/esp/metadata/managers/DatasetDiagnosticsTool.h b/src/esp/metadata/managers/DatasetDiagnosticsTool.h
index ad87452f45..5a6198e215 100644
--- a/src/esp/metadata/managers/DatasetDiagnosticsTool.h
+++ b/src/esp/metadata/managers/DatasetDiagnosticsTool.h
@@ -70,7 +70,7 @@ class DSDiagnosticRecord {
 
   typedef std::weak_ptr<T> WeakObjRef;
 
-  DSDiagnosticRecord(uint32_t diagnosticsFlags)
+  explicit DSDiagnosticRecord(uint32_t diagnosticsFlags)
       : _diagnosticsFlags(diagnosticsFlags) {}
 
   /**