diff --git a/lib/sqlite/NTMakefile b/lib/sqlite/NTMakefile
index ec8d1ebe4..3a6a4c269 100644
--- a/lib/sqlite/NTMakefile
+++ b/lib/sqlite/NTMakefile
@@ -39,7 +39,8 @@ INCFILES=	\
 
 # pmode 0600 = _S_IREAD | _S_IWRITE
 cdefines = $(cdefines) \
-	-DSQLITE_DEFAULT_FILE_PERMISSIONS=0600
+	-DSQLITE_DEFAULT_FILE_PERMISSIONS=0600 \
+	-DSQLITE_THREADSAFE=1
 
 $(LIBSQLITE): $(OBJ)\sqlite3.obj
 	$(LIBCON)