1 files changed, 1 insertions, 0 deletions
diff --git a/histlib.h b/histlib.h
index 10a40d7..422cf59 100644
--- a/histlib.h
+++ b/histlib.h
@@ -69,6 +69,7 @@ extern char *strchr ();
 #define BAD_WORD_SPEC	1
 #define SUBST_FAILED	2
 #define BAD_MODIFIER	3
+#define NO_PREV_SUBST	4
 
 /* Possible definitions for history starting point specification. */
 #define ANCHORED_SEARCH 1