diff --git a/stim/biomodels/network.h b/stim/biomodels/network.h
index bd799a0..06c376e 100644
--- a/stim/biomodels/network.h
+++ b/stim/biomodels/network.h
@@ -1113,7 +1113,7 @@ public:
 		unsigned int id = 0;									// split value								
 		for(unsigned e = 0; e < E.size(); e++){					// for every edge
 			for(unsigned p = 0; p < E[e].size() - 1; p++){		// for every point in each edge
-				int t = E[e].length() / sigma * 2;
+				int t = (int)(E[e].length() / sigma * 2);
 				if (t <= 20)
 					threshold_fac = E[e].size();
 				else
--
libgit2 0.21.4