diff --git a/src/core/border_router/routing_manager.hpp b/src/core/border_router/routing_manager.hpp
index c377b25d8..4a80d3c91 100644
--- a/src/core/border_router/routing_manager.hpp
+++ b/src/core/border_router/routing_manager.hpp
@@ -1474,7 +1474,7 @@ private:
         void               Start(void) { StartStop(/* aStart= */ true); }
         void               Stop(void) { StartStop(/* aStart= */ false); }
         bool               IsRunning(void) const { return GetState() == kDhcp6PdStateRunning; }
-        bool               HasPrefix(void) const { return IsValidOmrPrefix(mPrefix.GetPrefix()); }
+        bool               HasPrefix(void) const { return !mPrefix.IsEmpty(); }
         const Ip6::Prefix &GetPrefix(void) const { return mPrefix.GetPrefix(); }
         State              GetState(void) const;