diff --git a/source/lib/src/region.cc b/source/lib/src/region.cc
index 90704016c2..d8333e4929 100644
--- a/source/lib/src/region.cc
+++ b/source/lib/src/region.cc
@@ -22,8 +22,8 @@ Region<FPTYPE>::
   delete [] rec_boxt;
 }
 
-template struct Region<double>;
-template struct Region<float>;
+template struct deepmd::Region<double>;
+template struct deepmd::Region<float>;
 
 template<typename FPTYPE>
 inline FPTYPE