diff --git a/vendor/faddeeva/Faddeeva.hh b/include/openmc/external/Faddeeva.hh
similarity index 100%
rename from vendor/faddeeva/Faddeeva.hh
rename to include/openmc/external/Faddeeva.hh
diff --git a/vendor/faddeeva/Faddeeva.cc b/src/external/Faddeeva.cc
similarity index 99%
rename from vendor/faddeeva/Faddeeva.cc
rename to src/external/Faddeeva.cc
index 80e42228c..6a7051e24 100644
--- a/vendor/faddeeva/Faddeeva.cc
+++ b/src/external/Faddeeva.cc
@@ -157,7 +157,7 @@
 
 #ifdef __cplusplus
 
-#  include "Faddeeva.hh"
+#  include "openmc/external/Faddeeva.hh"
 
 #  include <cfloat>
 #  include <cmath>