diff --git a/tests/config.sh b/tests/config.sh
index ea8e5d0b6..deedaf3fd 100644
--- a/tests/config.sh
+++ b/tests/config.sh
@@ -5,7 +5,7 @@ DIFFPIPE="Analysis|CPU|memory|Date|Note"
 
 function spicetest () {
     $NGSPICE < $srcdir/$1.cir 2>&1 | egrep -v $DIFFPIPE > $1.test
-    if diff -u $1.test $srcdir/$1.out; then
+    if diff -u $srcdir/$1.out $1.test; then
 	rm $1.test
 	exit 0
     fi