diff --git a/regexp.c b/regexp.c
index 66c518d..9c1fdcf 100644
--- a/regexp.c
+++ b/regexp.c
@@ -107,7 +107,7 @@ static int dec(struct cstate *g, int c)
 	return 0;
 }
 
-#define ESCAPES "BbDdSsWw^$\\.*+?()[]{}|0123456789"
+#define ESCAPES "BbDdSsWw^$\\.*+?()[]{}|-0123456789"
 
 static int isunicodeletter(int c)
 {