diff --git a/depends/packages/bdb.mk b/depends/packages/bdb.mk
index 5aafb7e2b..0f59cc7f5 100644
--- a/depends/packages/bdb.mk
+++ b/depends/packages/bdb.mk
@@ -11,6 +11,7 @@ $(package)_config_opts_mingw32=--enable-mingw
 $(package)_config_opts_mingw64=--enable-mingw
 $(package)_config_opts_linux=--with-pic
 $(package)_cxxflags=-std=c++11
+$(package)_cppflags_mingw32=-DUNICODE -D_UNICODE
 endef
 
 define $(package)_preprocess_cmds