diff --git a/assembler/Makefile b/assembler/Makefile
index dae1e46d..bde7c178 100644
--- a/assembler/Makefile
+++ b/assembler/Makefile
@@ -1,11 +1,12 @@
 SOURCES = lex.c main.c gram.c
+CFLAGS = -g -O -Wall
 
 all: lextest
 
 y.tab.h: gram.c
 
 lextest: ${SOURCES}
-	cc -o lextest ${SOURCES}
+	cc ${CFLAGS} -o lextest ${SOURCES}
 
 clean:
 	rm -f gram.c lex.c