diff --git a/internal/constants/constants.go b/internal/constants/constants.go
index 0a0f3c69..9eba88f4 100644
--- a/internal/constants/constants.go
+++ b/internal/constants/constants.go
@@ -57,10 +57,7 @@ var (
 	// DSNSentry client keys to be able to report crashes to Sentry.
 	DSNSentry = ""
 
-	// APIHost is our API address.
-	APIHost = "https://api.protonmail.ch"
-
-	// The host name of the bridge server.
+	// Host is the hostname of the bridge server.
 	Host = "127.0.0.1"
 )
 
diff --git a/internal/constants/host_default.go b/internal/constants/host_default.go
new file mode 100644
index 00000000..fd839ab1
--- /dev/null
+++ b/internal/constants/host_default.go
@@ -0,0 +1,23 @@
+// Copyright (c) 2022 Proton AG
+//
+// This file is part of Proton Mail Bridge.
+//
+// Proton Mail Bridge is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Proton Mail Bridge is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Proton Mail Bridge. If not, see <https://www.gnu.org/licenses/>.
+
+//go:build !build_qa
+
+package constants
+
+// APIHost is our API address.
+const APIHost = "https://api.protonmail.ch"
diff --git a/internal/constants/host_qa.go b/internal/constants/host_qa.go
new file mode 100644
index 00000000..5566c1df
--- /dev/null
+++ b/internal/constants/host_qa.go
@@ -0,0 +1,31 @@
+// Copyright (c) 2022 Proton AG
+//
+// This file is part of Proton Mail Bridge.
+//
+// Proton Mail Bridge is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Proton Mail Bridge is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Proton Mail Bridge. If not, see <https://www.gnu.org/licenses/>.
+
+//go:build build_qa
+
+package constants
+
+import "os"
+
+// APIHost is our API address.
+var APIHost = "https://api.protonmail.ch"
+
+func init() {
+	if apiHost := os.Getenv("BRIDGE_HOST_URL"); apiHost != "" {
+		APIHost = apiHost
+	}
+}