diff --git a/mozilla/db/sqlite3/src/Makefile.in b/mozilla/db/sqlite3/src/Makefile.in
index 89603597aa0..c745170bfb6 100644
--- a/mozilla/db/sqlite3/src/Makefile.in
+++ b/mozilla/db/sqlite3/src/Makefile.in
@@ -96,12 +96,9 @@ CSRCS = \
 	$(NULL)
 
 # REFEF_IO allows us to override IO functions, which is used in the AsyncIO
-DEFINES = -DSQLITE_ENABLE_REDEF_IO
-
 # -DSQLITE_SECURE_DELETE=1 will cause SQLITE to 0-fill delete data so we
 # don't have to vacuum to make sure the data is not visible in the file.
-# Currently, this is removed because it slows down browser shutdown (as we
-# 0-fill all history entries that are expiring).
+DEFINES = -DSQLITE_ENABLE_REDEF_IO -DSQLITE_SECURE_DELETE=1
 
 ifdef ENABLE_TESTS
 ##LIBS = $(DIST)/lib/$(LIB_PREFIX)sqlite3_s.$(LIB_SUFFIX)