diff --git a/website/static/install/proto.ps1 b/website/static/install/proto.ps1
index 0051e7db511..b5a71c00285 100755
--- a/website/static/install/proto.ps1
+++ b/website/static/install/proto.ps1
@@ -21,7 +21,13 @@ $DownloadUrl = if ($Version -eq "latest") {
 
 $TempDir = "${HOME}\.proto\temp\proto\${Target}"
 $DownloadFile = "${TempDir}.zip"
-$InstallDir = "${Home}\.proto\bin"
+
+$InstallDir = if ($env:PROTO_INSTALL_DIR) {
+  $env:PROTO_INSTALL_DIR
+} else {
+  "${Home}\.proto\bin"
+}
+
 $BinPath = "${InstallDir}\proto.exe"
 
 # Download and unpack in temp dir
diff --git a/website/static/install/proto.sh b/website/static/install/proto.sh
index a35732aeed0..6f66f2b8505 100755
--- a/website/static/install/proto.sh
+++ b/website/static/install/proto.sh
@@ -51,7 +51,13 @@ fi
 
 temp_dir="$HOME/.proto/temp/proto/$target"
 download_file="$temp_dir$ext"
-install_dir="$HOME/.proto/bin"
+
+if [ -z "$PROTO_INSTALL_DIR" ]; then
+	install_dir="$HOME/.proto/bin"
+else
+	install_dir="$PROTO_INSTALL_DIR"
+fi
+
 bin_path="$install_dir/$bin"
 
 # Download and unpack in temp dir