diff --git a/configure b/configure
index d0ae103014a..c4b5e074254 100755
--- a/configure
+++ b/configure
@@ -30451,10 +30451,10 @@ CPPFLAGS=$save_CPPFLAGS
 case "$ac_sys_system" in
   Linux*) _PYTHREAD_NAME_MAXLEN=15;;  # Linux and Android
   SunOS*) _PYTHREAD_NAME_MAXLEN=31;;
-  NetBSD*) _PYTHREAD_NAME_MAXLEN=31;;
+  NetBSD*) _PYTHREAD_NAME_MAXLEN=15;; # gh-131268
   Darwin) _PYTHREAD_NAME_MAXLEN=63;;
   iOS) _PYTHREAD_NAME_MAXLEN=63;;
-  FreeBSD*) _PYTHREAD_NAME_MAXLEN=98;;
+  FreeBSD*) _PYTHREAD_NAME_MAXLEN=19;; # gh-131268
   *) _PYTHREAD_NAME_MAXLEN=;;
 esac
 if test -n "$_PYTHREAD_NAME_MAXLEN"; then
diff --git a/configure.ac b/configure.ac
index 8bb0f1c6ef4..a9ebfc78831 100644
--- a/configure.ac
+++ b/configure.ac
@@ -7559,10 +7559,10 @@ _RESTORE_VAR([CPPFLAGS])
 case "$ac_sys_system" in
   Linux*) _PYTHREAD_NAME_MAXLEN=15;;  # Linux and Android
   SunOS*) _PYTHREAD_NAME_MAXLEN=31;;
-  NetBSD*) _PYTHREAD_NAME_MAXLEN=31;;
+  NetBSD*) _PYTHREAD_NAME_MAXLEN=15;; # gh-131268
   Darwin) _PYTHREAD_NAME_MAXLEN=63;;
   iOS) _PYTHREAD_NAME_MAXLEN=63;;
-  FreeBSD*) _PYTHREAD_NAME_MAXLEN=98;;
+  FreeBSD*) _PYTHREAD_NAME_MAXLEN=19;; # gh-131268
   *) _PYTHREAD_NAME_MAXLEN=;;
 esac
 if test -n "$_PYTHREAD_NAME_MAXLEN"; then