diff --git a/src/Makefile.in b/src/Makefile.in
index 839bc2d116..89ece7fb3b 100644
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -27,6 +27,7 @@ INCLPATH = -I. \
            -I./engine/guid \
            -I./register \
            -Ireports \
+           -I@prefix@/lib/glib/include \
            -I@prefix@/include
 
 GNOME_CFLAGS += -I./gnome