diff --git a/lib/roken/NTMakefile b/lib/roken/NTMakefile
index a9f7eaf03..b52cfec52 100644
--- a/lib/roken/NTMakefile
+++ b/lib/roken/NTMakefile
@@ -154,6 +154,7 @@ INCFILES = 				\
 	$(INCDIR)\roken.h	\
 	$(INCDIR)\roken-common.h	\
 	$(INCDIR)\rtbl.h	\
+	$(INCDIR)\stdbool.h	\
 	$(INCDIR)\syslog.h	\
 	$(INCDIR)\vis.h		\
 	$(INCDIR)\xdbm.h
diff --git a/lib/roken/stdbool.h b/lib/roken/stdbool.h
new file mode 100644
index 000000000..cdaee5b5d
--- /dev/null
+++ b/lib/roken/stdbool.h
@@ -0,0 +1,13 @@
+#ifndef _STDBOOL_H
+#define _STDBOOL_H
+
+#ifndef __GNUC__
+typedef int _Bool;
+#endif
+
+#define bool    _Bool
+#define true    1
+#define false   0
+#define __bool_true_false_are_defined 1
+
+#endif	/* _STDBOOL_H */