diff --git a/Makefile b/Makefile
index 05a96d7177..fc9d89498b 100644
--- a/Makefile
+++ b/Makefile
@@ -2236,6 +2236,7 @@ GIT-BUILD-OPTIONS: FORCE
 	@echo NO_PYTHON=\''$(subst ','\'',$(subst ','\'',$(NO_PYTHON)))'\' >>$@+
 	@echo NO_UNIX_SOCKETS=\''$(subst ','\'',$(subst ','\'',$(NO_UNIX_SOCKETS)))'\' >>$@+
 	@echo PAGER_ENV=\''$(subst ','\'',$(subst ','\'',$(PAGER_ENV)))'\' >>$@+
+	@echo DC_SHA1=\''$(subst ','\'',$(subst ','\'',$(DC_SHA1)))'\' >>$@+
 ifdef TEST_OUTPUT_DIRECTORY
 	@echo TEST_OUTPUT_DIRECTORY=\''$(subst ','\'',$(subst ','\'',$(TEST_OUTPUT_DIRECTORY)))'\' >>$@+
 endif
diff --git a/t/t0013-sha1dc.sh b/t/t0013-sha1dc.sh
new file mode 100755
index 0000000000..6d655cb161
--- /dev/null
+++ b/t/t0013-sha1dc.sh
@@ -0,0 +1,19 @@
+#!/bin/sh
+
+test_description='test sha1 collision detection'
+. ./test-lib.sh
+TEST_DATA="$TEST_DIRECTORY/t0013"
+
+if test -z "$DC_SHA1"
+then
+	skip_all='skipping sha1 collision tests, DC_SHA1 not set'
+	test_done
+fi
+
+test_expect_success 'test-sha1 detects shattered pdf' '
+	test_must_fail test-sha1 <"$TEST_DATA/shattered-1.pdf" 2>err &&
+	test_i18ngrep collision err &&
+	grep 38762cf7f55934b34d179ae6a4c80cadccbb7f0a err
+'
+
+test_done
diff --git a/t/t0013/shattered-1.pdf b/t/t0013/shattered-1.pdf
new file mode 100644
index 0000000000..ba9aaa145c
Binary files /dev/null and b/t/t0013/shattered-1.pdf differ