1 files changed, 4 insertions, 0 deletions
diff --git a/testsuite/cdev01/test_main.c b/testsuite/cdev01/test_main.c
index cbff9133..23aefa86 100644
--- a/testsuite/cdev01/test_main.c
+++ b/testsuite/cdev01/test_main.c
@@ -35,6 +35,7 @@
 #include <sys/time.h>
 #include <sys/uio.h>
 #include <sys/ioctl.h>
+#include <sys/mman.h>
 
 #include <assert.h>
 #include <errno.h>
@@ -125,6 +126,9 @@ static void test_cdev(const char *path)
 	assert(rv == -1);
 	assert(errno == TEST_KQ_ERRNO);
 
+	rv = mmap(NULL, 1, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+	assert(rv == 0);
+
 	rv = close(fd);
 	assert(rv == 0);