diff --git a/tests/unit_tests/plugins/auth-pam/test_search_and_replace.c b/tests/unit_tests/plugins/auth-pam/test_search_and_replace.c
index ee7a1518..5019bbd4 100644
--- a/tests/unit_tests/plugins/auth-pam/test_search_and_replace.c
+++ b/tests/unit_tests/plugins/auth-pam/test_search_and_replace.c
@@ -2,6 +2,7 @@
 #include <unistd.h>
 #include <stdlib.h>
 #include <stdarg.h>
+#include <stdint.h>
 #include <string.h>
 #include <setjmp.h>
 #include <cmocka.h>