diff --git a/sys/include/ape/stdbool.h b/sys/include/ape/stdbool.h
new file mode 100644
index 000000000..d0806ff65
--- /dev/null
+++ b/sys/include/ape/stdbool.h
@@ -0,0 +1,12 @@
+#ifndef __STDBOOL_H__
+#define __STDBOOL_H__
+
+/* Strictly speaking, this should be a built-in type. */
+typedef char _Bool;
+
+#define bool _Bool
+#define true 1
+#define false 0
+#define __bool_true_false_are_defined 1
+
+#endif