diff --git a/src/util.h b/src/util.h
index 045db03b5d..1b94bc2fc5 100644
--- a/src/util.h
+++ b/src/util.h
@@ -61,11 +61,6 @@ extern HeapLeakChecker* heap_checker;
 #include <pthread_np.h>
 #endif
 
-// Note: macro for internal use only during deprecation/namespacing process.
-#define ZEEK_FORWARD_DECLARE_NAMESPACED(cls, ns) \
-	namespace ns { class cls; } \
-	using cls [[deprecated("Remove in v4.1. Use " #ns "::" #cls " instead.")]] = ns::cls;
-
 [[deprecated("Remove in v4.1. Use uint64_t instead.")]]
 typedef uint64_t uint64;
 [[deprecated("Remove in v4.1. Use uint32_t instead.")]]
diff --git a/zeek-config.h.in b/zeek-config.h.in
index 5f5497f8a5..46971ac5a4 100644
--- a/zeek-config.h.in
+++ b/zeek-config.h.in
@@ -274,3 +274,8 @@ extern const char* BRO_VERSION_FUNCTION();
 	#define ZEEK_LSAN_DISABLE(x)
 	#define ZEEK_LSAN_DISABLE_SCOPE(x)
 #endif
+
+// Note: macro for internal use only during deprecation/namespacing process.
+#define ZEEK_FORWARD_DECLARE_NAMESPACED(cls, ns) \
+	namespace ns { class cls; } \
+	using cls [[deprecated("Remove in v4.1. Use " #ns "::" #cls " instead.")]] = ns::cls;