--- a/assembler/Makefile
+++ b/assembler/Makefile
@@ -30,7 +30,7 @@ BIN		= b43-asm.bin
 SRCS		= parser.c scanner.c main.c initvals.c util.c args.c
 
 # YACC related CFLAGS
-CFLAGS		+= -DYYSTYPE="void *" -DYYERROR_VERBOSE -DYYDEBUG -DYYENABLE_NLS=0 -DYYLTYPE_IS_TRIVIAL=0 -Wno-unused
+CFLAGS		+= -DYYSTYPE="void *" -DYYERROR_VERBOSE -DYYDEBUG=1 -DYYENABLE_NLS=0 -DYYLTYPE_IS_TRIVIAL=0 -Wno-unused
 
 .SUFFIXES:
 .PHONY: all install clean distclean
diff --git a/assembler/main.c b/assembler/main.c
index afca996..a62a15e 100644
--- a/assembler/main.c
+++ b/assembler/main.c
@@ -1260,7 +1260,7 @@ static void initialize(void)
 {
 	INIT_LIST_HEAD(&infile.sl);
 	INIT_LIST_HEAD(&infile.ivals);
-#ifdef YYDEBUG
+#if YYDEBUG
 	if (IS_INSANE_DEBUG)
 		yydebug = 1;
 	else
-- 
1.7.10.4

