diff --git a/newlib/libc/include/string.h b/newlib/libc/include/string.h
index 60e837bc08..32199c027a 100644
--- a/newlib/libc/include/string.h
+++ b/newlib/libc/include/string.h
@@ -130,7 +130,7 @@ char	*strlwr (char *);
 char	*strupr (char *);
 #endif
 
-#ifndef DEFS_H	/* Kludge to work around problem compiling in gdb */
+#if __POSIX_VISIBLE >= 200809
 char	*strsignal (int __signo);
 #endif