diff --git a/src/en-US.h b/src/en-US.h
index ad38c8b35..d5a811277 100644
--- a/src/en-US.h
+++ b/src/en-US.h
@@ -693,6 +693,7 @@
 #define STRING_UDA_NUMERIC           "The value '{1}' is not a valid numeric value."
 #define STRING_UDA_COLLISION         "The UDA named '{1}' is the same as a core attribute, and is not permitted."
 #define STRING_INVALID_MOD           "The '{1}' attribute does not allow a value of '{2}'."
+#define STRING_INVALID_SORT_COL      "The '{1}' column is not a valid sort field."
 
 // Feedback
 #define STRING_FEEDBACK_NO_TASKS     "No tasks."