diff --git a/src/lib/libc/string/strsignal.c b/src/lib/libc/string/strsignal.c
index a71a291f..fe2a7479 100644
--- a/src/lib/libc/string/strsignal.c
+++ b/src/lib/libc/string/strsignal.c
@@ -30,8 +30,6 @@
 #include <string.h>
 #include <limits.h>
 
-extern char *__strsignal(int, char *);
-
 char *
 strsignal(int sig)
 {