diff --git a/Documentation/howto/recover-corrupted-object-harder.txt b/Documentation/howto/recover-corrupted-object-harder.txt
index 9c4cd0915f..8994e2559e 100644
--- a/Documentation/howto/recover-corrupted-object-harder.txt
+++ b/Documentation/howto/recover-corrupted-object-harder.txt
@@ -80,7 +80,7 @@ valid pack like:
     # now add our object data
     cat object >>tmp.pack
     # and then append the pack trailer
-    /path/to/git.git/test-sha1 -b <tmp.pack >trailer
+    /path/to/git.git/t/helper/test-tool sha1 -b <tmp.pack >trailer
     cat trailer >>tmp.pack
 ------------
 
diff --git a/Makefile b/Makefile
index 416a8e39c1..3c0d0474af 100644
--- a/Makefile
+++ b/Makefile
@@ -653,6 +653,7 @@ X =
 PROGRAMS += $(patsubst %.o,git-%$X,$(PROGRAM_OBJS))
 
 TEST_BUILTINS_OBJS += test-chmtime.o
+TEST_BUILTINS_OBJS += test-sha1.o
 
 TEST_PROGRAMS_NEED_X += test-ctype
 TEST_PROGRAMS_NEED_X += test-config
@@ -684,7 +685,6 @@ TEST_PROGRAMS_NEED_X += test-regex
 TEST_PROGRAMS_NEED_X += test-revision-walking
 TEST_PROGRAMS_NEED_X += test-run-command
 TEST_PROGRAMS_NEED_X += test-scrap-cache-tree
-TEST_PROGRAMS_NEED_X += test-sha1
 TEST_PROGRAMS_NEED_X += test-sha1-array
 TEST_PROGRAMS_NEED_X += test-sigchain
 TEST_PROGRAMS_NEED_X += test-strcmp-offset
@@ -2502,7 +2502,7 @@ t/helper/test-tool$X: $(patsubst %,t/helper/%,$(TEST_BUILTINS_OBJS))
 t/helper/test-%$X: t/helper/test-%.o GIT-LDFLAGS $(GITLIBS)
 	$(QUIET_LINK)$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) $(filter %.a,$^) $(LIBS)
 
-check-sha1:: t/helper/test-sha1$X
+check-sha1:: t/helper/test-tool$X
 	t/helper/test-sha1.sh
 
 SP_OBJ = $(patsubst %.o,%.sp,$(C_OBJ))
diff --git a/t/helper/test-sha1.c b/t/helper/test-sha1.c
index a1c13f54ec..1ba0675c75 100644
--- a/t/helper/test-sha1.c
+++ b/t/helper/test-sha1.c
@@ -1,6 +1,7 @@
+#include "test-tool.h"
 #include "cache.h"
 
-int cmd_main(int ac, const char **av)
+int cmd__sha1(int ac, const char **av)
 {
 	git_SHA_CTX ctx;
 	unsigned char sha1[20];
diff --git a/t/helper/test-sha1.sh b/t/helper/test-sha1.sh
index 750b95a0a1..84594885c7 100755
--- a/t/helper/test-sha1.sh
+++ b/t/helper/test-sha1.sh
@@ -1,7 +1,7 @@
 #!/bin/sh
 
 dd if=/dev/zero bs=1048576 count=100 2>/dev/null |
-/usr/bin/time t/helper/test-sha1 >/dev/null
+/usr/bin/time t/helper/test-tool sha1 >/dev/null
 
 while read expect cnt pfx
 do
@@ -11,7 +11,7 @@ do
 			test -z "$pfx" || echo "$pfx"
 			dd if=/dev/zero bs=1048576 count=$cnt 2>/dev/null |
 			perl -pe 'y/\000/g/'
-		} | ./t/helper/test-sha1 $cnt
+		} | ./t/helper/test-tool sha1 $cnt
 	)
 	if test "$expect" = "$actual"
 	then
diff --git a/t/helper/test-tool.c b/t/helper/test-tool.c
index 0b1abe1ea2..11795130a6 100644
--- a/t/helper/test-tool.c
+++ b/t/helper/test-tool.c
@@ -8,6 +8,7 @@ struct test_cmd {
 
 static struct test_cmd cmds[] = {
 	{ "chmtime", cmd__chmtime },
+	{ "sha1", cmd__sha1 },
 };
 
 int cmd_main(int argc, const char **argv)
diff --git a/t/helper/test-tool.h b/t/helper/test-tool.h
index 3a35e70e79..a05b8bd14c 100644
--- a/t/helper/test-tool.h
+++ b/t/helper/test-tool.h
@@ -2,5 +2,6 @@
 #define __TEST_TOOL_H__
 
 int cmd__chmtime(int argc, const char **argv);
+int cmd__sha1(int argc, const char **argv);
 
 #endif
diff --git a/t/lib-pack.sh b/t/lib-pack.sh
index 7509846571..501078249d 100644
--- a/t/lib-pack.sh
+++ b/t/lib-pack.sh
@@ -85,7 +85,7 @@ pack_obj () {
 
 # Compute and append pack trailer to "$1"
 pack_trailer () {
-	test-sha1 -b <"$1" >trailer.tmp &&
+	test-tool sha1 -b <"$1" >trailer.tmp &&
 	cat trailer.tmp >>"$1" &&
 	rm -f trailer.tmp
 }
diff --git a/t/t0013-sha1dc.sh b/t/t0013-sha1dc.sh
index 6d655cb161..419f31a8f7 100755
--- a/t/t0013-sha1dc.sh
+++ b/t/t0013-sha1dc.sh
@@ -11,7 +11,7 @@ then
 fi
 
 test_expect_success 'test-sha1 detects shattered pdf' '
-	test_must_fail test-sha1 <"$TEST_DATA/shattered-1.pdf" 2>err &&
+	test_must_fail test-tool sha1 <"$TEST_DATA/shattered-1.pdf" 2>err &&
 	test_i18ngrep collision err &&
 	grep 38762cf7f55934b34d179ae6a4c80cadccbb7f0a err
 '