diff --git a/lib/libsysdecode/utrace.c b/lib/libsysdecode/utrace.c
--- a/lib/libsysdecode/utrace.c
+++ b/lib/libsysdecode/utrace.c
@@ -169,7 +169,8 @@
 	struct utrace_malloc um;
 	struct utrace_malloc32 *pm;
 #endif
-	static const char rtld_utrace_sig[RTLD_UTRACE_SIG_SZ] = RTLD_UTRACE_SIG;
+	static const char rtld_utrace_sig[RTLD_UTRACE_SIG_SZ] __nonstring =
+	    RTLD_UTRACE_SIG;
 
 	if (len == sizeof(struct utrace_rtld) && bcmp(p, rtld_utrace_sig,
 	    sizeof(rtld_utrace_sig)) == 0)
diff --git a/libexec/rtld-elf/rtld.c b/libexec/rtld-elf/rtld.c
--- a/libexec/rtld-elf/rtld.c
+++ b/libexec/rtld-elf/rtld.c
@@ -348,7 +348,8 @@
     int refcnt, const char *name)
 {
 	struct utrace_rtld ut;
-	static const char rtld_utrace_sig[RTLD_UTRACE_SIG_SZ] = RTLD_UTRACE_SIG;
+	static const char rtld_utrace_sig[RTLD_UTRACE_SIG_SZ] __nonstring =
+	    RTLD_UTRACE_SIG;
 
 	memset(&ut, 0, sizeof(ut));	/* clear holes */
 	memcpy(ut.sig, rtld_utrace_sig, sizeof(ut.sig));
diff --git a/libexec/rtld-elf/rtld_utrace.h b/libexec/rtld-elf/rtld_utrace.h
--- a/libexec/rtld-elf/rtld_utrace.h
+++ b/libexec/rtld-elf/rtld_utrace.h
@@ -49,7 +49,7 @@
 #define	RTLD_UTRACE_SIG			"RTLD"
 
 struct utrace_rtld {
-	char sig[RTLD_UTRACE_SIG_SZ];
+	char sig[RTLD_UTRACE_SIG_SZ] __nonstring;
 	int event;
 	void *handle;
 	void *mapbase;			/* Used for 'parent' and 'init/fini' */