diff -uNr nano-2.9.8/src/text.c nano-2.9.8.mod/src/text.c
--- nano-2.9.8/src/text.c	2018-06-02 11:20:07.000000000 +0300
+++ nano-2.9.8.mod/src/text.c	2018-06-19 19:03:48.071389233 +0300
@@ -1147,7 +1147,7 @@
 	/* Check which shell to use.  If none is specified, use /bin/sh. */
 	shellenv = getenv("SHELL");
 	if (shellenv == NULL)
-		shellenv = (char *) "/bin/sh";
+		shellenv = (char *) "@TERMUX_PREFIX@/bin/sh";
 
 	/* Fork a child process to run the command in. */
 	if ((pid = fork()) == 0) {