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-rw-r--r--lib/stdlib/src/string.erl2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/stdlib/src/string.erl b/lib/stdlib/src/string.erl
index 6636a03f06..c987c224db 100644
--- a/lib/stdlib/src/string.erl
+++ b/lib/stdlib/src/string.erl
@@ -201,7 +201,7 @@ chars(C, 0, Tail) when is_integer(C) ->
-spec copies(string(), non_neg_integer()) -> string().
-copies(CharList, Num) when is_list(CharList), Num >= 0 ->
+copies(CharList, Num) when is_list(CharList), is_integer(Num), Num >= 0 ->
copies(CharList, Num, []).
copies(_CharList, 0, R) ->