diff --git a/tests/nssmock.c b/tests/nssmock.c
index 7929c3061c..fc8e6b22f0 100644
--- a/tests/nssmock.c
+++ b/tests/nssmock.c
@@ -87,7 +87,7 @@ open(const char *path, int flags, ...)
         va_list ap;
         mode_t mode;
         va_start(ap, flags);
-        mode = va_arg(ap, int);
+        mode = (mode_t) va_arg(ap, int);
         va_end(ap);
         ret = real_open(newpath ? newpath : path, flags, mode);
     } else {
diff --git a/tests/vircgroupmock.c b/tests/vircgroupmock.c
index 56337c2f3e..51861be38e 100644
--- a/tests/vircgroupmock.c
+++ b/tests/vircgroupmock.c
@@ -731,7 +731,7 @@ int open(const char *path, int flags, ...)
         va_list ap;
         mode_t mode;
         va_start(ap, flags);
-        mode = va_arg(ap, mode_t);
+        mode = (mode_t) va_arg(ap, int);
         va_end(ap);
         ret = real_open(newpath ? newpath : path, flags, mode);
     } else {
diff --git a/tests/virpcimock.c b/tests/virpcimock.c
index 79352175de..7e4ac191d0 100644
--- a/tests/virpcimock.c
+++ b/tests/virpcimock.c
@@ -983,7 +983,7 @@ open(const char *path, int flags, ...)
         va_list ap;
         mode_t mode;
         va_start(ap, flags);
-        mode = va_arg(ap, mode_t);
+        mode = (mode_t) va_arg(ap, int);
         va_end(ap);
         ret = real_open(newpath ? newpath : path, flags, mode);
     } else {
diff --git a/tests/virtestmock.c b/tests/virtestmock.c
index 255dd43560..9b91adec77 100644
--- a/tests/virtestmock.c
+++ b/tests/virtestmock.c
@@ -180,7 +180,7 @@ int open(const char *path, int flags, ...)
         va_list ap;
         mode_t mode;
         va_start(ap, flags);
-        mode = va_arg(ap, mode_t);
+        mode = (mode_t) va_arg(ap, int);
         va_end(ap);
         ret = real_open(path, flags, mode);
     } else {