diff --git a/scripts/run-quiet b/scripts/run-quiet
index c4dc2a8..4b92d22 100755
--- a/scripts/run-quiet
+++ b/scripts/run-quiet
@@ -72,18 +72,23 @@ if [[ "${1:-}" == "sudo" ]]; then
     done
 fi
 
-cmd_str=""
-for arg in "$@"; do
-    cmd_str+="$(printf '%q ' "$arg")"
-done
-
-# Run inside a PTY so the command produces colored output.
-#   -q: quiet
-#   -e: return the child's exit status
-#   -f: flush output after each write (for live streaming)
-#   -c: command to run
-#   /dev/null: discard the typescript
-"${sudo_prefix[@]}" script -qefc "$cmd_str" /dev/null > "$log" 2>&1 &
+# Run inside a PTY so the command produces colored output. BSD `script`
+# (macOS) and util-linux `script` (Linux) take incompatible flags, so
+# branch on OS:
+#   -q: quiet (both)
+#   -e: return the child's exit status (both)
+#   -F (BSD) / -f (util-linux): flush after each write
+#   BSD takes the command as positional args after the typescript file;
+#   util-linux needs the command as a single string via -c.
+if [[ "$(uname)" == "Darwin" ]]; then
+    ${sudo_prefix[@]+"${sudo_prefix[@]}"} script -qeF /dev/null "$@" > "$log" 2>&1 &
+else
+    cmd_str=""
+    for arg in "$@"; do
+        cmd_str+="$(printf '%q ' "$arg")"
+    done
+    ${sudo_prefix[@]+"${sudo_prefix[@]}"} script -qefc "$cmd_str" /dev/null > "$log" 2>&1 &
+fi
 pid=$!
 
 frame=0