Fix debug symbol generation

1 files changed, 1 insertions, 1 deletions

diff --git a/src/gb/gb.h b/src/gb/gb.h
index 3e3f147dc..5d03aed36 100644
--- a/src/gb/gb.h
+++ b/src/gb/gb.h
@@ -6614,7 +6614,7 @@ gbString gb_string_append_fmt(gbString str, char const *fmt, ...) {
 	char buf[4096] = {0};
 	va_list va;
 	va_start(va, fmt);
-	res = gb_snprintf_va(str, gb_count_of(buf)-1, fmt, va);
+	res = gb_snprintf_va(buf, gb_count_of(buf)-1, fmt, va)-1;
 	va_end(va);
 	return gb_string_append_length(str, buf, res);
 }