diff --git a/shell.go b/shell.go
index fb836f3a..428bb496 100644
--- a/shell.go
+++ b/shell.go
@@ -15,15 +15,17 @@ const (
 
 // Shell is a type that contains a prompt and the command to set up the shell.
 type Shell struct {
-	Command []string
-	Env     []string
+	Command      []string
+	Env          []string
+	OverwriteEnv []string
 }
 
 // Shells contains a mapping from shell names to their Shell struct.
 var Shells = map[string]Shell{
 	bash: {
-		Env:     []string{"PS1=\\[\\e[38;2;90;86;224m\\]> \\[\\e[0m\\]", "BASH_SILENCE_DEPRECATION_WARNING=1"},
-		Command: []string{"bash", "--noprofile", "--norc", "--login", "+o", "history"},
+		Env:          []string{"PS1=\\[\\e[38;2;90;86;224m\\]> \\[\\e[0m\\]", "BASH_SILENCE_DEPRECATION_WARNING=1"},
+		Command:      []string{"bash", "--noprofile", "--norc", "--login", "+o", "history"},
+		OverwriteEnv: []string{"PROMPT_COMMAND="},
 	},
 	zsh: {
 		Env:     []string{`PROMPT=%F{#5B56E0}> %F{reset_color}`},
diff --git a/tty.go b/tty.go
index b32d19ff..6a31810d 100644
--- a/tty.go
+++ b/tty.go
@@ -40,7 +40,7 @@ func buildTtyCmd(port int, shell Shell) *exec.Cmd {
 
 	cmd := exec.Command("ttyd", args...)
 	if shell.Env != nil {
-		cmd.Env = append(shell.Env, os.Environ()...)
+		cmd.Env = append(append(shell.Env, os.Environ()...), shell.OverwriteEnv...)
 	}
 	return cmd
 }