diff --git a/ChangeLog b/ChangeLog
index 86c5184a4..248e9a915 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,7 @@
 2003-07-30  Alexandre Duret-Lutz  <aduret@src.lip6.fr>
 
+	* iface/gspn/dcswaveltl.test: Check for a false formula too.
+	
 	* iface/gspn/dcswaveltl.test, iface/gspn/ltlgspn.cc: New files.
 	* iface/gspn/Makefile.am (TESTS): Add dcswaveltl.test.
 	(ltlgspn_rg_LDADD, ltlgspn_srg_LDADD, ltlgspn_rg_SOURCES)
diff --git a/iface/gspn/dcswaveltl.test b/iface/gspn/dcswaveltl.test
index e1287a7b2..f4bf7f41f 100755
--- a/iface/gspn/dcswaveltl.test
+++ b/iface/gspn/dcswaveltl.test
@@ -6,4 +6,9 @@ set -e
 
 cp -R $srcdir/examples/DCSwave .
 
+# G(ATTiIDLj => F(!SCj U SCi)) is true
 ../ltlgspn-srg DCSwave/DCSWave '!G(ATTiIDLj => F(!SCj U SCi))' ATTiIDLj SCi SCj > output
+
+# G(F(!SCj U SCi)) is false
+../ltlgspn-srg DCSwave/DCSWave '!G(F(!SCj U SCi))' ATTiIDLj SCi SCj > output \
+  || test $? = 1