diff --git a/ginac/inifcns_nstdsums.cpp b/ginac/inifcns_nstdsums.cpp
index c39bfb7..ce6ceb1 100644
--- a/ginac/inifcns_nstdsums.cpp
+++ b/ginac/inifcns_nstdsums.cpp
@@ -1006,7 +1006,7 @@ G_do_hoelder(std::vector<cln::cl_N> x, /* yes, it's passed by value */
 		std::vector<int> qlsts;
 		for (std::size_t j = r; j >= 1; --j) {
 			qlstx.push_back(cln::cl_N(1) - x[j-1]);
-			if (instanceof(x[j-1], cln::cl_R_ring) && realpart(x[j-1]) > 1) {
+			if (imagpart(x[j-1])==0 && realpart(x[j-1]) >= 1) {
 				qlsts.push_back(1);
 			} else {
 				qlsts.push_back(-s[j-1]);