diff --git a/lex.c b/lex.c
index 9ff7069..0d2142c 100644
--- a/lex.c
+++ b/lex.c
@@ -30,7 +30,7 @@ THIS SOFTWARE.
 #include "ytab.h"
 
 extern YYSTYPE	yylval;
-extern int	infunc;
+extern bool	infunc;
 
 int	lineno	= 1;
 int	bracecnt = 0;
diff --git a/makefile b/makefile
index 6ed210f..d7d4bd2 100644
--- a/makefile
+++ b/makefile
@@ -22,6 +22,7 @@
 # THIS SOFTWARE.
 # ****************************************************************/
 
+CFLAGS = -fsanitize=address -O1 -g -fno-omit-frame-pointer -fno-optimize-sibling-calls
 CFLAGS = -g
 CFLAGS =
 CFLAGS = -O2