diff --git a/src/libs/vpatterndb/variables/vvariable_p.h b/src/libs/vpatterndb/variables/vvariable_p.h
index 0d85a9af6..c3d1a2565 100644
--- a/src/libs/vpatterndb/variables/vvariable_p.h
+++ b/src/libs/vpatterndb/variables/vvariable_p.h
@@ -45,7 +45,7 @@ public:
         : description()
     {}
 
-    VVariableData(const QString &description)
+    explicit VVariableData(const QString &description)
         : description(description)
     {}