diff --git a/app/operations/layer-modes/Makefile.am b/app/operations/layer-modes/Makefile.am
index 6aa906343c..2764580682 100644
--- a/app/operations/layer-modes/Makefile.am
+++ b/app/operations/layer-modes/Makefile.am
@@ -9,6 +9,7 @@ AM_CPPFLAGS = \
 	$(CAIRO_CFLAGS)				\
 	$(GEGL_CFLAGS)				\
 	$(GDK_PIXBUF_CFLAGS)			\
+	$(SSE2_EXTRA_CFLAGS)		\
 	-I$(includedir)
 
 noinst_LIBRARIES = \