4 files changed, 4 insertions, 0 deletions
diff --git a/src/tests/dlt-test-client.c b/src/tests/dlt-test-client.c
index d1fbe0a..092b8f2 100644
--- a/src/tests/dlt-test-client.c
+++ b/src/tests/dlt-test-client.c
@@ -72,6 +72,7 @@
 #include <sys/uio.h>    /* for writev() */
 #include <stdbool.h>
 #include <limits.h>
+#include <fcntl.h>
 
 #include "dlt_client.h"
 #include "dlt_protocol.h"
diff --git a/src/tests/dlt-test-multi-process-client.c b/src/tests/dlt-test-multi-process-client.c
index 8853d57..ca06612 100644
--- a/src/tests/dlt-test-multi-process-client.c
+++ b/src/tests/dlt-test-multi-process-client.c
@@ -45,6 +45,7 @@
 #include <string.h>
 #include <stdio.h>
 #include <unistd.h>
+#include <fcntl.h>
 #include <ctype.h>
 #include <stdlib.h>
 #include <time.h>
diff --git a/src/tests/dlt-test-multi-process.c b/src/tests/dlt-test-multi-process.c
index 47f6059..90682a3 100644
--- a/src/tests/dlt-test-multi-process.c
+++ b/src/tests/dlt-test-multi-process.c
@@ -45,6 +45,7 @@
 #include <stdio.h>
 #include <ctype.h>
 #include <unistd.h>
+#include <fcntl.h>
 #include <limits.h>
 #include <signal.h>
 #include <errno.h>
diff --git a/src/tests/dlt-test-stress-client.c b/src/tests/dlt-test-stress-client.c
index 5cbfeba..5370caa 100644
--- a/src/tests/dlt-test-stress-client.c
+++ b/src/tests/dlt-test-stress-client.c
@@ -68,6 +68,7 @@
 #include <ctype.h>      /* for isprint() */
 #include <stdlib.h>     /* for atoi() */
 #include <string.h>     /* for strcmp() */
+#include <fcntl.h>
 #include <sys/uio.h>    /* for writev() */
 
 #include "dlt_client.h"