diff --git a/test/runner-unix.c b/test/runner-unix.c
index b66df51b..9afcd1e4 100644
--- a/test/runner-unix.c
+++ b/test/runner-unix.c
@@ -49,7 +49,7 @@ void platform_init(int argc, char **argv) {
   /* Disable stdio output buffering. */
   setvbuf(stdout, NULL, _IONBF, 0);
   setvbuf(stderr, NULL, _IONBF, 0);
-  strcpy(executable_path, argv[0]);
+  strncpy(executable_path, argv[0], sizeof(executable_path) - 1);
   signal(SIGPIPE, SIG_IGN);
 }