diff --git a/include/openmc/distribution.h b/include/openmc/distribution.h
index 33ff2ffcbf..92c10aed3e 100644
--- a/include/openmc/distribution.h
+++ b/include/openmc/distribution.h
@@ -64,7 +64,7 @@ public:
   double sample(uint64_t* seed) const;
 
   double a() const { return a_; }
-  double b() const { return a_; }
+  double b() const { return b_; }
 private:
   double a_; //!< Lower bound of distribution
   double b_; //!< Upper bound of distribution