diff -ur mksh-56.orig/eval.c mksh-56/eval.c
--- mksh-56.orig/eval.c	2017-08-12 22:10:26.321676398 +0200
+++ mksh-56/eval.c	2017-08-12 22:40:32.672676143 +0200
@@ -1005,6 +1005,7 @@
 				switch (ord(c)) {
 				case ORD('['):
 				case ORD('!'):
+				case ORD(NOT2):
 				case ORD('-'):
 				case ORD(']'):
 					/*
diff -ur mksh-56.orig/misc.c mksh-56/misc.c
--- mksh-56.orig/misc.c	2017-08-12 22:10:26.321676398 +0200
+++ mksh-56/misc.c	2017-08-12 22:40:32.672676143 +0200
@@ -966,7 +966,7 @@
 	char *subp;
 
 	/* check for negation */
-	if (ISMAGIC(p[0]) && ord(p[1]) == ORD('!')) {
+	if (ISMAGIC(p[0]) && (ord(p[1]) == ORD('!') || ord(p[1]) == ORD(NOT2))) {
 		p += 2;
 		negated = true;
 	}
diff -ur mksh-56.orig/sh.h mksh-56/sh.h
--- mksh-56.orig/sh.h	2017-08-12 22:10:26.325009789 +0200
+++ mksh-56/sh.h	2017-08-12 22:40:32.696009488 +0200
@@ -550,6 +550,7 @@
  */
 #define MAGIC		KSH_BEL	/* prefix for *?[!{,} during expand */
 #define ISMAGIC(c)	(ord(c) == ORD(MAGIC))
+#define NOT2		'^'
 
 EXTERN const char *safe_prompt; /* safe prompt if PS1 substitution fails */
 
diff -ur mksh-56.orig/check.t mksh-56/check.t
--- mksh-56.orig/check.t	2017-08-12 22:10:26.321676398 +0200
+++ mksh-56/check.t	2017-08-12 22:41:46.886083258 +0200
@@ -2438,7 +2438,7 @@
 	!bc +bc ,bc 0bc 1bc ^bc cbc
 	!bc +bc ,bc -bc 0bc 1bc ^bc cbc
 	abc bbc
-	^bc abc bbc
+	!bc +bc ,bc -bc 0bc 1bc ^bc cbc
 	+bc ,bc -bc
 	-bc 0bc 1bc
 ---