diff --git a/lib/libqof/qof/Makefile.am b/lib/libqof/qof/Makefile.am
index dba58fa291..664f53810d 100644
--- a/lib/libqof/qof/Makefile.am
+++ b/lib/libqof/qof/Makefile.am
@@ -95,10 +95,10 @@ qofla-dir.h: $(srcdir)/qofla-dir.h.in Makefile
 BUILT_SOURCES = qofla-dir.h
 CLEANFILES = $(BUILT_SOURCES)
 
-## For testing the qofmath128 routines, uncomment the following
-## lines and run the test-qofmath program.
-#noinst_PROGRAMS = test-qofmath
-#test_qofmath_SOURCES=gnc-numeric.c
-#DEFS=-DTEST_128_BIT_MULT
-#test_qofmath_LDFLAGS=$(libgncqof_la_LDFLAGS)
-#test_qofmath_LDADD=$(libgncqof_la_LIBADD)
+## For testing the qofmath128 routines
+# run "make check" (to build the test program) and then run test-qofmath
+check_PROGRAMS = test-qofmath
+test_qofmath_SOURCES=gnc-numeric.c
+test_qofmath_CPPFLAGS=$(libgncqof_la_CPPFLAGS) -DTEST_128_BIT_MULT
+test_qofmath_LDFLAGS=$(libgncqof_la_LDFLAGS)
+test_qofmath_LDADD=$(libgncqof_la_LIBADD)