diff --git a/src/libopensc/log.c b/src/libopensc/log.c
index 0a897dd6..4756fe17 100644
--- a/src/libopensc/log.c
+++ b/src/libopensc/log.c
@@ -92,7 +92,7 @@ void sc_do_log(struct sc_context *ctx, int type, const char *file, int line, con
 void sc_do_log_va(struct sc_context *ctx, int type, const char *file, int line, const char *func, const char *format, va_list args)
 {
 	FILE *outf = NULL;
-	char buf[1024], *p;
+	char buf[1536], *p;
 	int left, r;
 	const char *color_pfx = "", *color_sfx = "";