diff --git a/Cantera/src/CVodesIntegrator.h b/Cantera/src/CVodesIntegrator.h
index b4bd6f5b4..d7a31bc8a 100644
--- a/Cantera/src/CVodesIntegrator.h
+++ b/Cantera/src/CVodesIntegrator.h
@@ -28,6 +28,7 @@
 #ifdef SUNDIALS_VERSION_22
 #include <nvector_serial.h>
 #else
+//#include <sundials/config.h>
 #include <sundials/sundials_nvector.h>
 #endif
 
diff --git a/ext/f2c_libs/arith.h b/ext/f2c_libs/arith.h
index 9841db38a..9746f9c1c 100644
--- a/ext/f2c_libs/arith.h
+++ b/ext/f2c_libs/arith.h
@@ -1,3 +1,3 @@
-#define IEEE_8087
-#define Arith_Kind_ASL 1
-#define NANCHECK
+#define IEEE_8087
+#define Arith_Kind_ASL 1
+#define Double_Align