diff --git a/configure.ac b/configure.ac
index ee55dbf..5a2008d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -27,7 +27,7 @@ AC_CANONICAL_BUILD
 AC_CANONICAL_HOST
 AC_ISC_POSIX
 
-AM_INIT_AUTOMAKE(1.6 dist-bzip2)
+AM_INIT_AUTOMAKE(1.6 dist-bzip2 subdir-objects)
 AC_CONFIG_HEADERS(config.h)
 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
 
diff --git a/src/bin/Makefile.am b/src/bin/Makefile.am
index 032f699..1e22409 100644
--- a/src/bin/Makefile.am
+++ b/src/bin/Makefile.am
@@ -16,13 +16,13 @@ bin_PROGRAMS += efbb_ql
 endif
 
 GAME_SOURCES = \
-	$(builddir)/game_world.c \
+	game_world.c \
 	main.c \
 	main_screen.c \
 	level_select_screen.c \
 	cannon.c \
 	sound.c \
-        score.c \
+	score.c \
 	bg.c
 
 efbb_LDADD = @EFBB_LIBS@