diff --git a/CGAL_Core/include/CGAL/CORE/BigRat.h b/CGAL_Core/include/CGAL/CORE/BigRat.h
index 7cfe573d068..0dd724775af 100644
--- a/CGAL_Core/include/CGAL/CORE/BigRat.h
+++ b/CGAL_Core/include/CGAL/CORE/BigRat.h
@@ -115,8 +115,8 @@ public:
     mpq_clear(mp);
   }
 
-  CORE_NEW(BigRatRep)
-  CORE_DELETE(BigRatRep)
+  CGAL_CORE_EXPORT CORE_NEW(BigRatRep)
+  CGAL_CORE_EXPORT CORE_DELETE(BigRatRep)
 
   mpq_srcptr get_mp() const {
     return mp;
@@ -486,7 +486,6 @@ inline BigInt BigIntValue(const BigRat& a) {
   return a.BigIntValue();
 }
 
-  CORE_MEMORY_IMPL(BigRatRep)
 
 } //namespace CORE
 #endif // _CORE_BIGRAT_H_
diff --git a/CGAL_Core/include/CGAL/CORE/Expr_impl.h b/CGAL_Core/include/CGAL/CORE/Expr_impl.h
index d253c949c83..5fbebb9d1ad 100644
--- a/CGAL_Core/include/CGAL/CORE/Expr_impl.h
+++ b/CGAL_Core/include/CGAL/CORE/Expr_impl.h
@@ -1211,6 +1211,7 @@ void BinOpRep::debugTree(int level, int indent, int depthLimit) const {
 }
 
 
+CORE_MEMORY_IMPL(BigRatRep)
 CORE_MEMORY_IMPL(ConstDoubleRep)
 CORE_MEMORY_IMPL(ConstRealRep)
 CORE_MEMORY_IMPL(NegRep)
@@ -1247,4 +1248,5 @@ template class Realbase_for<BigRat>;
 template class Realbase_for<BigFloat>;
 
  template class ConstPolyRep<Expr>;
+ template class ConstPolyRep<BigFloat>;
 } //namespace CORE