diff --git a/src/Makefile.am b/src/Makefile.am
index 54b8f0f0..49315ded 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1,8 +1,8 @@
 bin_PROGRAMS = fwknop
 
 fwknop_SOURCES = fwknop.c fwknop.h config_init.c config_init.h \
-				 fwkop_common.h spa_comm.c spa_comm.h utils.c utils.h \
-				 getpasswd.c getpasswd.h
+                 fwknop_common.h spa_comm.c spa_comm.h utils.c utils.h \
+                 getpasswd.c getpasswd.h
 
 fwknop_LDADD = $(top_builddir)/fko/libfko.la
 fwknop_CPPFLAGS = -I $(top_srcdir)/fko