diff --git a/tool/build/lib/pty.c b/tool/build/lib/pty.c
index 264bb0ecc..32d63cccc 100644
--- a/tool/build/lib/pty.c
+++ b/tool/build/lib/pty.c
@@ -641,15 +641,18 @@ static void PtyDeleteLines(struct Pty *pty) {
 }
 
 static void PtyReportDeviceStatus(struct Pty *pty) {
-  PtyWriteInput(pty, "\e[0n", 4);
+  static const char report[] = "\e[0n";
+  PtyWriteInput(pty, report, strlen(report));
 }
 
 static void PtyReportPreferredVtType(struct Pty *pty) {
-  PtyWriteInput(pty, "\e[?1;0c", 4);
+  static const char report[] = "\e[?1;0c";
+  PtyWriteInput(pty, report, strlen(report));
 }
 
 static void PtyReportPreferredVtIdentity(struct Pty *pty) {
-  PtyWriteInput(pty, "\e/Z", 4);
+  static const char report[] = "\e/Z";
+  PtyWriteInput(pty, report, strlen(report));
 }
 
 static void PtyBell(struct Pty *pty) {