--- a/mail/send.c
+++ b/mail/send.c
@@ -1518,7 +1518,7 @@
 
   argv[0] = getenv ("SHELL");
   if (!argv[0])
-    argv[0] = "/bin/sh";
+    argv[0] = "@TERMUX_PREFIX@/bin/sh";
   argv[1] = "-c";
   argv[2] = (char*) cmd;
   argv[3] = NULL;