diff --git a/src/Makefile.am b/src/Makefile.am
index f42516df2..9f9c9dd53 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1,6 +1,7 @@
 ## Process this file with automake to produce Makefile.in
 
 INCLUDES = 					\
+	-DPANGO_ENABLE_ENGINE			\
 	-DSYSCONFDIR=\"$(sysconfdir)\" 		\
 	-DLIBDIR=\"$(libdir)\" 			\
 	$(FREETYPE_CFLAGS)			\