diff --git a/src/testdir/Make_amiga.mak b/src/testdir/Make_amiga.mak
index 183a809..901a7c1 100644
--- a/src/testdir/Make_amiga.mak
+++ b/src/testdir/Make_amiga.mak
@@ -45,6 +45,7 @@
 		test_charsearch.out \
 		test_close_count.out \
 		test_command_count.out \
+		test_comparators.out \
 		test_erasebackword.out \
 		test_eval.out \
 		test_fixeol.out \
@@ -198,6 +199,7 @@
 test_charsearch.out: test_charsearch.in
 test_close_count.out: test_close_count.in
 test_command_count.out: test_command_count.in
+test_comparators.out: test_comparators.in
 test_erasebackword.out: test_erasebackword.in
 test_eval.out: test_eval.in
 test_increment.out: test_increment.in
diff --git a/src/testdir/Make_dos.mak b/src/testdir/Make_dos.mak
index 0f9514c..603f4a4 100644
--- a/src/testdir/Make_dos.mak
+++ b/src/testdir/Make_dos.mak
@@ -44,6 +44,7 @@
 		test_charsearch.out \
 		test_close_count.out \
 		test_command_count.out \
+		test_comparators.out \
 		test_erasebackword.out \
 		test_eval.out \
 		test_fixeol.out \
diff --git a/src/testdir/Make_ming.mak b/src/testdir/Make_ming.mak
index 9ce78bf..1b76bcc 100644
--- a/src/testdir/Make_ming.mak
+++ b/src/testdir/Make_ming.mak
@@ -66,6 +66,7 @@
 		test_charsearch.out \
 		test_close_count.out \
 		test_command_count.out \
+		test_comparators.out \
 		test_erasebackword.out \
 		test_eval.out \
 		test_fixeol.out \
diff --git a/src/testdir/Make_os2.mak b/src/testdir/Make_os2.mak
index cac8f9c..08f78cb 100644
--- a/src/testdir/Make_os2.mak
+++ b/src/testdir/Make_os2.mak
@@ -46,6 +46,7 @@
 		test_charsearch.out \
 		test_close_count.out \
 		test_command_count.out \
+		test_comparators.out \
 		test_erasebackword.out \
 		test_eval.out \
 		test_fixeol.out \
diff --git a/src/testdir/Make_vms.mms b/src/testdir/Make_vms.mms
index d90f59a..6e77153 100644
--- a/src/testdir/Make_vms.mms
+++ b/src/testdir/Make_vms.mms
@@ -4,7 +4,7 @@
 # Authors:	Zoltan Arpadffy, <arpadffy@polarhome.com>
 #		Sandor Kopanyi,  <sandor.kopanyi@mailbox.hu>
 #
-# Last change:  2015 Aug 11
+# Last change:  2015 Sep 01
 #
 # This has been tested on VMS 6.2 to 8.3 on DEC Alpha, VAX and IA64.
 # Edit the lines in the Configuration section below to select.
@@ -105,6 +105,7 @@
 	 test_charsearch.out \
 	 test_close_count.out \
 	 test_command_count.out \
+	 test_comparators.out \
 	 test_erasebackword.out \
 	 test_eval.out \
 	 test_fixeol.out \
diff --git a/src/testdir/Makefile b/src/testdir/Makefile
index 7edebbe..f29ec8b 100644
--- a/src/testdir/Makefile
+++ b/src/testdir/Makefile
@@ -42,6 +42,7 @@
 		test_charsearch.out \
 		test_close_count.out \
 		test_command_count.out \
+		test_comparators.out \
 		test_erasebackword.out \
 		test_eval.out \
 		test_fixeol.out \
diff --git a/src/testdir/test_comparators.in b/src/testdir/test_comparators.in
new file mode 100644
index 0000000..53a12a3
--- /dev/null
+++ b/src/testdir/test_comparators.in
@@ -0,0 +1,21 @@
+" Test for expression comparators.   vim: set ft=vim :
+
+
+STARTTEST
+:so small.vim
+:try
+:  let oldisident=&isident
+:  set isident+=#
+:  if 1 is#1
+:    $put ='ok'
+:  else
+:    $put ='ng'
+:  endif
+:finally
+:  let &isident=oldisident
+:endtry
+:"
+:/^marker/+1,$wq! test.out
+ENDTEST
+
+marker
diff --git a/src/testdir/test_comparators.ok b/src/testdir/test_comparators.ok
new file mode 100644
index 0000000..9766475
--- /dev/null
+++ b/src/testdir/test_comparators.ok
@@ -0,0 +1 @@
+ok