diff --git a/include/openmc/position.h b/include/openmc/position.h
index 97ab6f0e66..d7a13c01e7 100644
--- a/include/openmc/position.h
+++ b/include/openmc/position.h
@@ -1,6 +1,7 @@
 #ifndef OPENMC_POSITION_H
 #define OPENMC_POSITION_H
 
+#include <cmath>
 #include <vector>
 
 namespace openmc {
@@ -46,6 +47,9 @@ struct Position {
   inline double dot(Position other) {
     return x*other.x + y*other.y + z*other.z;
   }
+  inline double norm() {
+    return std::sqrt(x*x + y*y + z*z);
+  }
 
   // Data members
   double x = 0.;