diff --git a/src/compHorner.c b/src/compHorner.c
index 31b8509..bddcdf5 100644
--- a/src/compHorner.c
+++ b/src/compHorner.c
@@ -293,4 +293,5 @@ static const R_CallMethodDef CallEntries[] = {
 void R_init_minimaxApprox(DllInfo *dll) {
   R_registerRoutines(dll, NULL, CallEntries, NULL, NULL);
   R_useDynamicSymbols(dll, FALSE);
+  R_forceSymbols(dll, TRUE);
 }