diff --git a/CHANGELOG b/CHANGELOG
index 98d082c..20562bd 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -13,6 +13,7 @@
 - fix parse confusion between attribute and attribute value.
 - fix version passed to get_supported_ver_and_cost.
 - mark map instances stale so they aren't "cleaned" during updates.
+- fix large file compile time option.
 
 18/06/2007 autofs-5.0.2
 -----------------------
diff --git a/Makefile.rules b/Makefile.rules
index b1d1a49..30716dc 100644
--- a/Makefile.rules
+++ b/Makefile.rules
@@ -44,7 +44,7 @@ CXXFLAGS  = $(CFLAGS)
 LD        = ld
 SOLDFLAGS = -shared
 
-CFLAGS += -D_REENTRANT
+CFLAGS += -D_REENTRANT -D_FILE_OFFSET_BITS=64
 LDFLAGS += -lpthread
 
 ifdef DMALLOCLIB