diff --git a/test/shaping/Makefile.am b/test/shaping/Makefile.am
index fa1faf5129cacf5335852c6fbd63ba430e17138d..ffcba9772c72783ed85f7f34bb2e3847a4d4be88 100644
--- a/test/shaping/Makefile.am
+++ b/test/shaping/Makefile.am
@@ -15,7 +15,6 @@ EXTRA_DIST += \
 	hb-diff \
 	hb-diff-colorize \
 	hb-diff-filter-failures \
-	hb-diff-ngrams \
 	hb-diff-stat \
 	hb-unicode-decode \
 	hb-unicode-encode \
diff --git a/test/shaping/hb-diff-ngrams b/test/shaping/hb-diff-ngrams
deleted file mode 100755
index c02f5415f75f2249b418b7b238b4ecca06e53b01..0000000000000000000000000000000000000000
--- a/test/shaping/hb-diff-ngrams
+++ /dev/null
@@ -1,5 +0,0 @@
-#!/usr/bin/env python
-
-from hb_test_tools import *
-
-UtilMains.process_multiple_files (DiffSinks.print_ngrams)
diff --git a/test/shaping/hb_test_tools.py b/test/shaping/hb_test_tools.py
index c9bb1dd33c5792f2be35cf7cbd23f066c7f5ec4b..f7e5943470354dce1235b7262baa4763bdc9c5e6 100644
--- a/test/shaping/hb_test_tools.py
+++ b/test/shaping/hb_test_tools.py
@@ -293,32 +293,6 @@ class DiffSinks:
 		total = passed + failed
 		print ("%d out of %d tests passed.  %d failed (%g%%)" % (passed, total, failed, 100. * failed / total))
 
-	@staticmethod
-	def print_ngrams (f, ns=(1,2,3)):
-		gens = tuple (Ngram.generator (n) for n in ns)
-		allstats = Stats ()
-		allgrams = {}
-		for key, lines in DiffHelpers.separate_test_cases (f):
-			test = Test (lines)
-			allstats.add (test)
-
-			for gen in gens:
-				for ngram in gen (test.unicodes):
-					if ngram not in allgrams:
-						allgrams[ngram] = Stats ()
-					allgrams[ngram].add (test)
-
-		importantgrams = {}
-		for ngram, stats in allgrams.iteritems ():
-			if stats.failed.count >= 30: # for statistical reasons
-				importantgrams[ngram] = stats
-		allgrams = importantgrams
-		del importantgrams
-
-		for ngram, stats in allgrams.iteritems ():
-			print ("zscore: %9f failed: %6d passed: %6d ngram: <%s>" % (stats.zscore (allstats), stats.failed.count, stats.passed.count, ','.join ("U+%04X" % u for u in ngram)))
-
-
 
 class Test: