diff --git a/src/backend/file/test/Makefile.am b/src/backend/file/test/Makefile.am
index 50440ec4da..822572b68d 100644
--- a/src/backend/file/test/Makefile.am
+++ b/src/backend/file/test/Makefile.am
@@ -57,7 +57,8 @@ AM_CFLAGS = \
   -I${top_srcdir}/src/engine \
   -I${top_srcdir}/src/engine/test-core \
   -I.. \
-  ${GLIB_CFLAGS}
+  ${GLIB_CFLAGS} \
+  ${GUILE_INCS}
 
 EXTRA_DIST = \
   grab-types.pl \