diff --git a/libiberty/dyn-string.c b/libiberty/dyn-string.c
index ea711182ca5..8d2456b86c8 100644
--- a/libiberty/dyn-string.c
+++ b/libiberty/dyn-string.c
@@ -277,7 +277,7 @@ dyn_string_insert_cstr (dyn_string_t dest, int pos, const char *src)
   for (i = dest->length; i >= pos; --i)
     dest->s[i + length] = dest->s[i];
   /* Splice in the new stuff.  */
-  strncpy (dest->s + pos, src, length);
+  memcpy (dest->s + pos, src, length);
   /* Compute the new length.  */
   dest->length += length;
   return 1;