diff --git a/lib/kstrtox.c b/lib/kstrtox.c
index d586e6af5e5a..bdde40cd69d7 100644
--- a/lib/kstrtox.c
+++ b/lib/kstrtox.c
@@ -351,6 +351,8 @@ int kstrtobool(const char *s, bool *res)
 		return -EINVAL;
 
 	switch (s[0]) {
+	case 'e':
+	case 'E':
 	case 'y':
 	case 'Y':
 	case 't':
@@ -358,6 +360,8 @@ int kstrtobool(const char *s, bool *res)
 	case '1':
 		*res = true;
 		return 0;
+	case 'd':
+	case 'D':
 	case 'n':
 	case 'N':
 	case 'f':