diff --git a/get.sh b/get.sh
index 4ea96c2..c1a0577 100644
--- a/get.sh
+++ b/get.sh
@@ -59,8 +59,10 @@ step "Running installer"
 cd "$DEST"
 
 # exec replaces this process with install.sh and reconnects stdin to /dev/tty
-# so interactive prompts work correctly even when this script was piped from curl
-if [[ -e /dev/tty ]]; then
+# so interactive prompts work correctly even when this script was piped from curl.
+# Use a test-open to check /dev/tty is actually accessible (it may exist but be
+# unusable in non-interactive SSH sessions or container environments).
+if { true </dev/tty; } 2>/dev/null; then
     exec bash install.sh "$@" </dev/tty
 else
     exec bash install.sh "$@"
diff --git a/install.sh b/install.sh
index 6bebe0e..a0ddfff 100755
--- a/install.sh
+++ b/install.sh
@@ -40,7 +40,7 @@ ask() {
     [[ $AUTO_YES -eq 1 ]] && return 0
     if [[ -t 0 ]]; then
         read -r -p "$1 [y/N] " reply
-    elif [[ -e /dev/tty ]]; then
+    elif { true </dev/tty; } 2>/dev/null; then
         read -r -p "$1 [y/N] " reply </dev/tty
     else
         # No terminal available — default to no (safe)