diff --git a/tests/nixos/ca-fd-leak/sender.c b/tests/nixos/ca-fd-leak/sender.c
index 8356b2479..2ec79947a 100644
--- a/tests/nixos/ca-fd-leak/sender.c
+++ b/tests/nixos/ca-fd-leak/sender.c
@@ -19,7 +19,7 @@ int main(int argc, char **argv) {
     struct sockaddr_un data;
     data.sun_family = AF_UNIX;
     data.sun_path[0] = 0;
-    strcpy(data.sun_path + 1, argv[1]);
+    strncpy(data.sun_path + 1, argv[1], sizeof(data.sun_path) - 2);
 
     // Now try to connect, To ensure we work no matter what order we are
     // executed in, just busyloop here.
diff --git a/tests/nixos/ca-fd-leak/smuggler.c b/tests/nixos/ca-fd-leak/smuggler.c
index 3f89af5bb..7279c48bf 100644
--- a/tests/nixos/ca-fd-leak/smuggler.c
+++ b/tests/nixos/ca-fd-leak/smuggler.c
@@ -5,6 +5,7 @@
 #include <stdio.h>
 #include <unistd.h>
 #include <assert.h>
+#include <string.h>
 
 int main(int argc, char **argv) {