diff --git a/include/cantera/base/Solution.h b/include/cantera/base/Solution.h
index 136eca8ca..1ffe4c82a 100644
--- a/include/cantera/base/Solution.h
+++ b/include/cantera/base/Solution.h
@@ -115,8 +115,8 @@ public:
 
     //! Get the name of an adjacent phase by index
     string adjacentName(size_t i) const {
-        if (i < 0 || i >= m_adjacent.size()) {
-            throw CanteraError("Solution::adjacentName", "Invalid index {}.", i);
+        if (i >= m_adjacent.size()) {
+            throw IndexError("Solution::adjacentName", "m_adjacent", i, m_adjacent.size()-1);
         }
         return m_adjacent.at(i)->name();
     }