diff --git a/include/sys/types.h b/include/sys/types.h
index 248cf24..89310f0 100644
--- a/include/sys/types.h
+++ b/include/sys/types.h
@@ -8,6 +8,7 @@
 #ifndef LIBCRYPTOCOMPAT_SYS_TYPES_H
 #define LIBCRYPTOCOMPAT_SYS_TYPES_H
 
+#include <db.h>
 #include <stdint.h>
 
 #ifdef __MINGW32__