diff --git a/src/optional/python-bindings/Makefile.am b/src/optional/python-bindings/Makefile.am
index 8196c68575..29fcdd2d01 100644
--- a/src/optional/python-bindings/Makefile.am
+++ b/src/optional/python-bindings/Makefile.am
@@ -1,6 +1,6 @@
 SUBDIRS = . tests
 
-SWIG_SOURCES = gnucash_core.i timespec.i
+SWIG_FILES = gnucash_core.i timespec.i
 
 pkgpython_PYTHON = \
   __init__.py \
@@ -37,18 +37,18 @@ _gnucash_core_c_la_LIBADD = \
   ${top_builddir}/src/business/business-core/libgncmod-business-core.la
 
 if BUILDING_FROM_SVN
-gnucash_core.c: $(SWIG_SOURCES) ${top_srcdir}/src/base-typemaps.i $(top_builddir)/config.h
+gnucash_core.c: $(SWIG_FILES) ${top_srcdir}/src/base-typemaps.i $(top_builddir)/config.h
 	swig -python -Wall -Werror \
         -I$(top_srcdir)/src -I$(top_srcdir)/src/engine \
 		-I$(top_srcdir)/src/business/business-core \
         -I${top_srcdir}/src/libqof/qof \
 		-o $@ $<
 
-gnucash_core_c.py: gnucash_core.c $(SWIG_SOURCES)
+gnucash_core_c.py: gnucash_core.c $(SWIG_FILES)
 endif
 
 EXTRA_DIST = \
-  $(SWIG_SOURCES) \
+  $(SWIG_FILES) \
   example_scripts/simple_book.py \
   example_scripts/simple_session.py \
   example_scripts/simple_test.py \