diff --git a/src/signal/sigaction.c b/src/signal/sigaction.c
index 18956c6b..5bc9383b 100644
--- a/src/signal/sigaction.c
+++ b/src/signal/sigaction.c
@@ -3,9 +3,13 @@
 #include <errno.h>
 #include "syscall.h"
 #include "pthread_impl.h"
+#include "libc.h"
 
 void __restore(), __restore_rt();
 
+static pthread_t dummy(void) { return 0; }
+weak_alias(dummy, __pthread_self_def);
+
 int __libc_sigaction(int sig, const struct sigaction *sa, struct sigaction *old)
 {
 	struct {
@@ -23,6 +27,7 @@ int __libc_sigaction(int sig, const struct sigaction *sa, struct sigaction *old)
 		pksa = (long)&ksa;
 	}
 	if (old) pkold = (long)&kold;
+	__pthread_self_def();
 	if (syscall(SYS_rt_sigaction, sig, pksa, pkold, 8))
 		return -1;
 	if (old) {
diff --git a/src/thread/pthread_self.c b/src/thread/pthread_self.c
index cc2ddfb7..51f12bb3 100644
--- a/src/thread/pthread_self.c
+++ b/src/thread/pthread_self.c
@@ -19,7 +19,7 @@ static int init_main_thread()
 	return 0;
 }
 
-pthread_t pthread_self()
+pthread_t __pthread_self_def()
 {
 	static int init, failed;
 	if (!init) {
@@ -31,4 +31,5 @@ pthread_t pthread_self()
 	return __pthread_self();
 }
 
-weak_alias(pthread_self, __pthread_self_init);
+weak_alias(__pthread_self_def, pthread_self);
+weak_alias(__pthread_self_def, __pthread_self_init);