diff --git a/app/src/sys/unix/file.c b/app/src/sys/unix/file.c
index 4e9e45b3..47b5d8f9 100644
--- a/app/src/sys/unix/file.c
+++ b/app/src/sys/unix/file.c
@@ -2,6 +2,7 @@
 
 #include <limits.h>
 #include <stdlib.h>
+#include <stdio.h>
 #include <string.h>
 #include <sys/stat.h>
 #include <unistd.h>
diff --git a/app/src/v4l2_sink.c b/app/src/v4l2_sink.c
index 753d5b6a..429d3f1a 100644
--- a/app/src/v4l2_sink.c
+++ b/app/src/v4l2_sink.c
@@ -1,5 +1,7 @@
 #include "v4l2_sink.h"
 
+#include <string.h>
+
 #include "util/log.h"
 #include "util/str.h"
 
diff --git a/app/tests/test_str.c b/app/tests/test_str.c
index 770ddd95..c66bb2f4 100644
--- a/app/tests/test_str.c
+++ b/app/tests/test_str.c
@@ -3,6 +3,7 @@
 #include <assert.h>
 #include <limits.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 
 #include "util/str.h"
diff --git a/app/tests/test_strbuf.c b/app/tests/test_strbuf.c
index 97417677..58562522 100644
--- a/app/tests/test_strbuf.c
+++ b/app/tests/test_strbuf.c
@@ -2,6 +2,7 @@
 
 #include <assert.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 
 #include "util/strbuf.h"