diff --git a/tests/decoder.c b/tests/decoder.c
index 6679cc10c9..1b3ceaea01 100644
--- a/tests/decoder.c
+++ b/tests/decoder.c
@@ -21,7 +21,6 @@
  */
 
 #include "gst/vaapi/sysdeps.h"
-#include <string.h>
 #include <gst/vaapi/gstvaapidecoder_h264.h>
 #include <gst/vaapi/gstvaapidecoder_jpeg.h>
 #include <gst/vaapi/gstvaapidecoder_mpeg2.h>
diff --git a/tests/output.c b/tests/output.c
index 3469fd39aa..e1ac5cc628 100644
--- a/tests/output.c
+++ b/tests/output.c
@@ -21,7 +21,6 @@
  */
 
 #include "gst/vaapi/sysdeps.h"
-#include <string.h>
 #include <gst/gst.h>
 #if USE_DRM
 # include <gst/vaapi/gstvaapidisplay_drm.h>
diff --git a/tests/test-decode.c b/tests/test-decode.c
index cc1688bc1c..81bab85d86 100644
--- a/tests/test-decode.c
+++ b/tests/test-decode.c
@@ -23,7 +23,6 @@
  */
 
 #include "gst/vaapi/sysdeps.h"
-#include <string.h>
 #include <gst/vaapi/gstvaapisurface.h>
 #include "decoder.h"
 #include "output.h"
diff --git a/tests/test-subpicture.c b/tests/test-subpicture.c
index c3298abe71..b193e10319 100644
--- a/tests/test-subpicture.c
+++ b/tests/test-subpicture.c
@@ -21,7 +21,6 @@
  */
 
 #include "gst/vaapi/sysdeps.h"
-#include <string.h>
 #include <gst/vaapi/gstvaapisurface.h>
 #include "decoder.h"
 #include "output.h"