diff --git a/stim/biomodels/centerline.h b/stim/biomodels/centerline.h
index 90ba645..b4b3d3f 100644
--- a/stim/biomodels/centerline.h
+++ b/stim/biomodels/centerline.h
@@ -330,8 +330,10 @@ public:
 #endif
 			}
 			else {
-				auto smallest = std::min_element(dist.begin(), dist.end());
-				auto i = std::distance(dist.begin(), smallest);		// find the index of min-distance in distance list
+			//	auto smallest = std::min_element(dist.begin(), dist.end());
+				unsigned int smallest = std::min_element(dist.begin(), dist.end());
+			//	auto i = std::distance(dist.begin(), smallest);		// find the index of min-distance in distance list
+				unsigned int i = std::distance(dist.begin(), smallest);		// find the index of min-distance in distance list
 
 				// stitch position in c1 and c2
 				int id1 = index[i];
--
libgit2 0.21.4