diff --git a/libc/startup/linux/x86_64/start.cpp b/libc/startup/linux/x86_64/start.cpp
--- a/libc/startup/linux/x86_64/start.cpp
+++ b/libc/startup/linux/x86_64/start.cpp
@@ -89,9 +89,7 @@
 
 // Sets the thread pointer to |val|. Returns true on success, false on failure.
 static bool set_thread_ptr(uintptr_t val) {
-  return __llvm_libc::syscall_impl(SYS_arch_prctl, ARCH_SET_FS, val) == -1
-             ? false
-             : true;
+  return __llvm_libc::syscall_impl(SYS_arch_prctl, ARCH_SET_FS, val) != -1;
 }
 
 using InitCallback = void(int, char **, char **);