diff --git a/libc/private/grp_pwd.h b/libc/private/grp_pwd.h
index e1aff4f..ab79586 100644
--- a/libc/private/grp_pwd.h
+++ b/libc/private/grp_pwd.h
@@ -31,18 +31,20 @@
 #include <grp.h>
 #include <pwd.h>
 
+static constexpr size_t kGrpPwdBufferSize = 32;
+
 struct group_state_t {
   group group_;
   char* group_members_[2];
-  char group_name_buffer_[32];
+  char group_name_buffer_[kGrpPwdBufferSize];
   // Must be last so init_group_state can run a simple memset for the above
   ssize_t getgrent_idx;
 };
 
 struct passwd_state_t {
   passwd passwd_;
-  char name_buffer_[32];
-  char dir_buffer_[32];
-  char sh_buffer_[32];
+  char name_buffer_[kGrpPwdBufferSize];
+  char dir_buffer_[kGrpPwdBufferSize];
+  char sh_buffer_[kGrpPwdBufferSize];
   ssize_t getpwent_idx;
 };