diff -ur dash-0.5.9.1.orig/src/mystring.c dash-0.5.9.1/src/mystring.c
--- dash-0.5.9.1.orig/src/mystring.c	2017-02-28 00:14:47.000000000 +0100
+++ dash-0.5.9.1/src/mystring.c	2017-02-28 00:10:40.000000000 +0100
@@ -55,6 +55,7 @@
 #include "memalloc.h"
 #include "parser.h"
 #include "system.h"
+#include "token_vars.h"
 
 
 char nullstr[1];		/* zero length string */
@@ -181,11 +182,29 @@
 	return 1;
 }
 
+/*
+ * Check if a string is identical to a shell keyword (reserved word).
+ */
+
+int
+is_kwd(const char *s)
+{
+	int i = 0;
+
+	do {
+		if (strcmp(s, parsekwd[i++]) == 0)
+			return 1;
+	} while (*parsekwd[i-1] != '}');  /* assuming that "}" is last entry */
+	
+	return 0;
+}
+	
 
 /*
  * Produce a possibly single quoted string suitable as input to the shell.
  * If 'conditional' is nonzero, quoting is only done if the string contains
- * non-shellsafe characters; if it is zero, quoting is always done.
+ * non-shellsafe characters, or is identical to a shell keyword (reserved
+ * word); if it is zero, quoting is always done.
  * If quoting was done, the return string is allocated on the stack,
  * otherwise a pointer to the original string is returned.
  */
@@ -194,7 +213,7 @@
 single_quote(const char *s, int conditional) {
 	char *p;
 
-	if (conditional && s[strspn(s, SHELLSAFECHARS)] == '\0')
+	if (conditional && s[strspn(s, SHELLSAFECHARS)] == '\0' && ! is_kwd(s))
 		return (char *)s;
 
 	STARTSTACKSTR(p);
diff -ur dash-0.5.9.1.orig/src/mystring.h dash-0.5.9.1/src/mystring.h
--- dash-0.5.9.1.orig/src/mystring.h	2017-02-28 00:14:47.000000000 +0100
+++ dash-0.5.9.1/src/mystring.h	2017-02-28 00:10:40.000000000 +0100
@@ -63,4 +63,4 @@
 #define scopy(s1, s2)	((void)strcpy(s2, s1))
 
 /* Characters that don't need quoting before re-entry into the shell */
-#define SHELLSAFECHARS "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz%+,./:=@_^!-"
+#define SHELLSAFECHARS "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz%+,./:@_^-"