diff --git a/app/src/sys/unix/file.c b/app/src/sys/unix/file.c
index 4e9e45b..47b5d8f 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 753d5b6..429d3f1 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 770ddd9..c66bb2f 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 9741767..5856252 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"