diff --git a/libmpcodecs/ae.c b/libmpcodecs/ae.c
index 6ed3deee4c..8749d5e633 100644
--- a/libmpcodecs/ae.c
+++ b/libmpcodecs/ae.c
@@ -2,6 +2,7 @@
 #include <string.h>
 #include <stdlib.h>
 #include <inttypes.h>
+#include <unistd.h>
 #include <math.h>
 #include "aviheader.h"
 #include "ms_hdr.h"
diff --git a/libmpcodecs/ae_lame.c b/libmpcodecs/ae_lame.c
index e5f6067067..186544eee0 100644
--- a/libmpcodecs/ae_lame.c
+++ b/libmpcodecs/ae_lame.c
@@ -1,6 +1,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <inttypes.h>
+#include <unistd.h>
 #include <string.h>
 #include "m_option.h"
 #include "../mp_msg.h"
diff --git a/libmpcodecs/ae_lavc.c b/libmpcodecs/ae_lavc.c
index 953de256a1..52df828422 100644
--- a/libmpcodecs/ae_lavc.c
+++ b/libmpcodecs/ae_lavc.c
@@ -1,6 +1,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <inttypes.h>
+#include <unistd.h>
 #include <string.h>
 #include "m_option.h"
 #include "../mp_msg.h"
diff --git a/libmpcodecs/ae_pcm.c b/libmpcodecs/ae_pcm.c
index 2fb2973bfb..147619060a 100644
--- a/libmpcodecs/ae_pcm.c
+++ b/libmpcodecs/ae_pcm.c
@@ -1,6 +1,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <inttypes.h>
+#include <unistd.h>
 #include <string.h>
 #include "m_option.h"
 #include "../mp_msg.h"
diff --git a/libmpcodecs/ae_toolame.c b/libmpcodecs/ae_toolame.c
index 396258f620..cfcb533e50 100644
--- a/libmpcodecs/ae_toolame.c
+++ b/libmpcodecs/ae_toolame.c
@@ -1,6 +1,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <inttypes.h>
+#include <unistd.h>
 #include <string.h>
 #include "m_option.h"
 #include "../mp_msg.h"