diff --git a/Cantera/src/oneD/Solid1D.cpp b/Cantera/src/oneD/Solid1D.cpp
index 40821b342..a55cbe256 100644
--- a/Cantera/src/oneD/Solid1D.cpp
+++ b/Cantera/src/oneD/Solid1D.cpp
@@ -22,7 +22,7 @@
 
 #include "Solid1D.h"
 #include "../ArrayViewer.h"
-#include "ctml.h"
+#include "../ctml.h"
 #include "MultiJac.h"
 
 using namespace ctml;