diff --git a/src/libutil/logging.hh b/src/libutil/logging.hh
index 9ab2091c7..6f81b92de 100644
--- a/src/libutil/logging.hh
+++ b/src/libutil/logging.hh
@@ -4,7 +4,7 @@
 #include "error.hh"
 #include "config.hh"
 
-#include <nlohmann/json.hpp>
+#include <nlohmann/json_fwd.hpp>
 
 namespace nix {