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diff --git a/t/redo-sh.tests/dependency_rebuild_1/test b/t/redo-sh.tests/dependency_rebuild_1/test
new file mode 100755
index 0000000..ea3a7cd
--- /dev/null
+++ b/t/redo-sh.tests/dependency_rebuild_1/test
@@ -0,0 +1,16 @@
+#!/bin/sh -eu
+# A target must be rebuilt when a dependency changes.
+>all.do printf 'redo-ifchange a\n'
+>a.do printf 'redo-ifchange b\ndate +%s\n'
+>b printf '1'
+
+redo
+<a read -r timestamp_a1
+
+sleep 1
+>b printf '2'
+
+redo
+<a read -r timestamp_a2
+
+test ${timestamp_a2} -gt ${timestamp_a1}