diff --git a/Makefile.am b/Makefile.am
index bc702d10..656045c7 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -69,8 +69,8 @@ apple2ix_SOURCES = src/font.c src/rom.c src/misc.c src/display.c src/vm.c \
 apple2ix_CFLAGS = @AM_CFLAGS@ @X_CFLAGS@
 apple2ix_CCASFLAGS = $(apple2ix_CFLAGS)
 apple2ix_LDFLAGS =
-apple2ix_LDADD = @ASM_O@ @INTERFACE_O@ @VIDEO_O@ @AUDIO_O@ @META_O@ @X_LIBS@
-apple2ix_DEPENDENCIES = @ASM_O@ @INTERFACE_O@ @VIDEO_O@ @AUDIO_O@ @META_O@
+apple2ix_LDADD = @ASM_O@ @VIDEO_O@ @AUDIO_O@ @META_O@ @X_LIBS@
+apple2ix_DEPENDENCIES = @ASM_O@ @VIDEO_O@ @AUDIO_O@ @META_O@
 
 genfont_SOURCES = src/genfont.c
 
diff --git a/configure.ac b/configure.ac
index e61e2989..faf00e64 100644
--- a/configure.ac
+++ b/configure.ac
@@ -260,8 +260,6 @@ AC_ARG_ENABLE([debugger], AS_HELP_STRING([--disable-debugger], [Disable 6502 deb
 ])
 AC_SUBST(META_O)
 
-INTERFACE_O="src/interface.o"
-AC_SUBST(INTERFACE_O)
 AC_DEFINE(INTERFACE_CLASSIC, 1, [Use the classic menu interface])
 
 dnl ---------------------------------------------------------------------------