diff --git a/libc/kernel/tools/defaults.py b/libc/kernel/tools/defaults.py
index ac12fc7..5340216 100644
--- a/libc/kernel/tools/defaults.py
+++ b/libc/kernel/tools/defaults.py
@@ -97,6 +97,9 @@
     # Remove unused macros (http://b/262917450).
     "__force": "",
     "__user": "",
+    # Rename the kernel's sigaction so we can expose our POSIX one publicly,
+    # but translate to the kernel's one internally.
+    "sigaction": "__kernel_sigaction",
     }
 
 
diff --git a/libc/kernel/uapi/asm-arm/asm/signal.h b/libc/kernel/uapi/asm-arm/asm/signal.h
index 838bb13..fde3b9e 100644
--- a/libc/kernel/uapi/asm-arm/asm/signal.h
+++ b/libc/kernel/uapi/asm-arm/asm/signal.h
@@ -52,7 +52,7 @@
 #define MINSIGSTKSZ 2048
 #define SIGSTKSZ 8192
 #include <asm-generic/signal-defs.h>
-struct sigaction {
+struct __kernel_sigaction {
   union {
     __sighandler_t _sa_handler;
     void(* _sa_sigaction) (int, struct siginfo *, void *);
diff --git a/libc/kernel/uapi/asm-generic/signal.h b/libc/kernel/uapi/asm-generic/signal.h
index bea99a7..21c7100 100644
--- a/libc/kernel/uapi/asm-generic/signal.h
+++ b/libc/kernel/uapi/asm-generic/signal.h
@@ -61,7 +61,7 @@
 #ifdef SA_RESTORER
 #define __ARCH_HAS_SA_RESTORER
 #endif
-struct sigaction {
+struct __kernel_sigaction {
   __sighandler_t sa_handler;
   unsigned long sa_flags;
 #ifdef SA_RESTORER
diff --git a/libc/kernel/uapi/asm-x86/asm/signal.h b/libc/kernel/uapi/asm-x86/asm/signal.h
index 2e51445..96ac8fb 100644
--- a/libc/kernel/uapi/asm-x86/asm/signal.h
+++ b/libc/kernel/uapi/asm-x86/asm/signal.h
@@ -56,7 +56,7 @@
 #include <asm-generic/signal-defs.h>
 #ifndef __ASSEMBLY__
 #ifdef __i386__
-struct sigaction {
+struct __kernel_sigaction {
   union {
     __sighandler_t _sa_handler;
     void(* _sa_sigaction) (int, struct siginfo *, void *);
@@ -68,7 +68,7 @@
 #define sa_handler _u._sa_handler
 #define sa_sigaction _u._sa_sigaction
 #else
-struct sigaction {
+struct __kernel_sigaction {
   __sighandler_t sa_handler;
   unsigned long sa_flags;
   __sigrestore_t sa_restorer;