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-rw-r--r--src/eval.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/eval.c b/src/eval.c
index 850f3866145..7034f43ca5a 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -1451,7 +1451,7 @@ find_handler_clause (handlers, conditions, sig, data, debugger_value_ptr)
if (wants_debugger (Vstack_trace_on_error, conditions))
{
-#ifdef __STDC__
+#ifdef PROTOTYPES
internal_with_output_to_temp_buffer ("*Backtrace*",
(Lisp_Object (*) (Lisp_Object)) Fbacktrace,
Qnil);