diff --git a/include/all.hxx b/include/all.hxx
index cc64d3b..d763941 100755
--- a/include/all.hxx
+++ b/include/all.hxx
@@ -37,7 +37,7 @@ extern string verbosity;
 #define use_bmi_flag FALSE       // TODO set to TRUE to run in BMI environment
 
 #define MAX_NUM_SOIL_LAYERS 4
-#define MAX_NUM_SOIL_TYPES 15
+#define MAX_NUM_SOIL_TYPES 16
 #define MAX_SOIL_NAME_CHARS 25
 #define MAX_NUM_WETTING_FRONTS 300