diff --git a/src/Makefile.am b/src/Makefile.am
index 8999673..6129033 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1,4 +1,4 @@
-AM_CFLAGS="-Wall"
+AM_CFLAGS=-Wall
 bin_PROGRAMS = tio
 tio_SOURCES = tty.c \
               options.c \