diff --git a/gcc/gimple-ssa-warn-access.cc b/gcc/gimple-ssa-warn-access.cc
index 950d96bf9d62f318773af490ef0176fe5ea22082..5061af389c23d63f806837ab8c174e98c0a8d031 100644
--- a/gcc/gimple-ssa-warn-access.cc
+++ b/gcc/gimple-ssa-warn-access.cc
@@ -607,7 +607,8 @@ maybe_warn_nonstring_arg (tree fndecl, GimpleOrTree exp)
 	{
 	  if (tree arrbnd = TYPE_DOMAIN (type))
 	    {
-	      if ((arrbnd = TYPE_MAX_VALUE (arrbnd)))
+	      if ((arrbnd = TYPE_MAX_VALUE (arrbnd))
+		  && TREE_CODE (arrbnd) == INTEGER_CST)
 		{
 		  asize = wi::to_offset (arrbnd) + 1;
 		  known_size = true;
diff --git a/gcc/testsuite/gcc.dg/pr117254.c b/gcc/testsuite/gcc.dg/pr117254.c
new file mode 100644
index 0000000000000000000000000000000000000000..c7a510677f13a9f4e2b9904083db103df8f03a04
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr117254.c
@@ -0,0 +1,10 @@
+/* { dg-do compile } */
+/* { dg-options "" } */
+
+int g;
+void e(int s) {
+  struct {
+    __attribute__((nonstring)) char bn[g];
+  } f;
+  __builtin_strncpy (f.bn, f.bn, s);
+}