diff --git a/project/config/cfgdefs.sh b/project/config/cfgdefs.sh
index 1790aab..a8e4d53 100644
--- a/project/config/cfgdefs.sh
+++ b/project/config/cfgdefs.sh
@@ -72,6 +72,9 @@ printf 'void * addr = &X509_NAME_ENTRY_set;'           \
 	printf 'CFLAGS_CONFIG\t\t+= -DOPENSSL_VERSION_1_1\n' \
 		>> $mb_pwd/cfgdefs.mk
 
+# ncurses: python refers to the internals of typedef struct _win_st WINDOW
+printf 'CFLAGS_CONFIG\t\t+= -DNCURSES_INTERNALS' >> $mb_pwd/cfgdefs.mk
+
 
 # system tests: (native) pycompile
 printf '\n\n#system tests: (native) pycompile\n' >> $mb_pwd/cfgdefs.mk