diff --git a/tools/acrn-crashlog/acrnprobe/main.c b/tools/acrn-crashlog/acrnprobe/main.c
index e5aad5c79..be4789990 100644
--- a/tools/acrn-crashlog/acrnprobe/main.c
+++ b/tools/acrn-crashlog/acrnprobe/main.c
@@ -85,7 +85,7 @@ int main(int argc, char *argv[])
 				 NULL)) != -1) {
 		switch (op) {
 		case 'c':
-			strncpy(cfg, optarg, PATH_MAX);
+			strncpy(cfg, optarg, PATH_MAX - 1);
 			break;
 		case 'h':
 			usage();