diff --git a/src/shell_manager.cc b/src/shell_manager.cc
index f7857dab..f6623db3 100644
--- a/src/shell_manager.cc
+++ b/src/shell_manager.cc
@@ -25,7 +25,7 @@ ShellManager::ShellManager()
     // Get a guaranteed to be POSIX shell binary
     {
         auto size = confstr(_CS_PATH, 0, 0);
-        String path; path.resize(size, 0);
+        String path; path.resize(size-1, 0);
         confstr(_CS_PATH, path.data(), size);
         for (auto dir : StringView{path} | split<StringView>(':'))
         {