diff --git a/libc/kernel/tools/defaults.py b/libc/kernel/tools/defaults.py
index b4d823e..8c41cc6 100644
--- a/libc/kernel/tools/defaults.py
+++ b/libc/kernel/tools/defaults.py
@@ -63,6 +63,9 @@
     # The kernel's _NSIG/NSIG are one less than the userspace value, so we need to move them aside.
     "_NSIG": "_KERNEL__NSIG",
     "NSIG": "_KERNEL_NSIG",
+    # The kernel's SIGRTMIN/SIGRTMAX are absolute limits; userspace steals a few.
+    "SIGRTMIN": "__SIGRTMIN",
+    "SIGRTMAX": "__SIGRTMAX",
     }
 
 # this is the set of known static inline functions that we want to keep