diff --git a/tools/Makefile.in b/tools/Makefile.in
index c608f986e3a..94b5ac192e4 100644
--- a/tools/Makefile.in
+++ b/tools/Makefile.in
@@ -1,4 +1,4 @@
-DEFS      = -DLEX_OUTPUT_ROOT="\"@LEX_OUTPUT_ROOT@\"" -DINCLUDEDIR="\"$(includedir)\"" -DBINDIR="\"$(bindir)\""
+DEFS      = -DLEX_OUTPUT_ROOT="\"@LEX_OUTPUT_ROOT@\"" -DINCLUDEDIR="\"$(includedir)\""
 TOPSRCDIR = @top_srcdir@
 TOPOBJDIR = ..
 SRCDIR    = @srcdir@