diff --git a/src/gui/Makefile.am b/src/gui/Makefile.am
index 9e017c5d..12695b17 100644
--- a/src/gui/Makefile.am
+++ b/src/gui/Makefile.am
@@ -3,6 +3,6 @@ AM_CPPFLAGS = -I$(top_srcdir)/include
 noinst_LIBRARIES = libgui.a
 libgui_a_SOURCES = sdlmain.cpp sdl_mapper.cpp dosbox_logo.h \
 	render.cpp render_scalers.cpp render_scalers.h \
-	render_templates.h render_loops.h \
+	render_templates.h render_loops.h render_simple.h \
 	midi.cpp midi_win32.h midi_oss.h midi_coreaudio.h midi_alsa.h