diff --git a/apbs/externals/geoflow_c b/apbs/externals/geoflow_c
index 8a6ff87e8e..e8ce510a67 160000
--- a/apbs/externals/geoflow_c
+++ b/apbs/externals/geoflow_c
@@ -1 +1 @@
-Subproject commit 8a6ff87e8e45b586a1b8f8a877a472c55eff69e1
+Subproject commit e8ce510a670e0b7f3501e72be6141fc20328f947