diff --git a/otautil/DirUtil.cpp b/otautil/DirUtil.cpp
index e08e360..ad344de 100644
--- a/otautil/DirUtil.cpp
+++ b/otautil/DirUtil.cpp
@@ -160,59 +160,3 @@
     }
     return 0;
 }
-
-int
-dirUnlinkHierarchy(const char *path)
-{
-    struct stat st;
-    DIR *dir;
-    struct dirent *de;
-    int fail = 0;
-
-    /* is it a file or directory? */
-    if (lstat(path, &st) < 0) {
-        return -1;
-    }
-
-    /* a file, so unlink it */
-    if (!S_ISDIR(st.st_mode)) {
-        return unlink(path);
-    }
-
-    /* a directory, so open handle */
-    dir = opendir(path);
-    if (dir == NULL) {
-        return -1;
-    }
-
-    /* recurse over components */
-    errno = 0;
-    while ((de = readdir(dir)) != NULL) {
-        //TODO: don't blow the stack
-        char dn[PATH_MAX];
-        if (!strcmp(de->d_name, "..") || !strcmp(de->d_name, ".")) {
-            continue;
-        }
-        snprintf(dn, sizeof(dn), "%s/%s", path, de->d_name);
-        if (dirUnlinkHierarchy(dn) < 0) {
-            fail = 1;
-            break;
-        }
-        errno = 0;
-    }
-    /* in case readdir or unlink_recursive failed */
-    if (fail || errno < 0) {
-        int save = errno;
-        closedir(dir);
-        errno = save;
-        return -1;
-    }
-
-    /* close directory handle */
-    if (closedir(dir) < 0) {
-        return -1;
-    }
-
-    /* delete target directory */
-    return rmdir(path);
-}
diff --git a/otautil/DirUtil.h b/otautil/DirUtil.h
index 85b83c3..beecc10 100644
--- a/otautil/DirUtil.h
+++ b/otautil/DirUtil.h
@@ -17,13 +17,8 @@
 #ifndef MINZIP_DIRUTIL_H_
 #define MINZIP_DIRUTIL_H_
 
-#include <stdbool.h>
 #include <utime.h>
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 struct selabel_handle;
 
 /* Like "mkdir -p", try to guarantee that all directories
@@ -43,12 +38,4 @@
         const struct utimbuf *timestamp, bool stripFileName,
         struct selabel_handle* sehnd);
 
-/* rm -rf <path>
- */
-int dirUnlinkHierarchy(const char *path);
-
-#ifdef __cplusplus
-}
-#endif
-
 #endif  // MINZIP_DIRUTIL_H_
diff --git a/tests/unit/dirutil_test.cpp b/tests/unit/dirutil_test.cpp
index 5e2ae4f..e62032c 100644
--- a/tests/unit/dirutil_test.cpp
+++ b/tests/unit/dirutil_test.cpp
@@ -116,35 +116,3 @@
   ASSERT_EQ(0, rmdir((prefix + "/a/b").c_str()));
   ASSERT_EQ(0, rmdir((prefix + "/a").c_str()));
 }
-
-TEST(DirUtilTest, unlink_invalid) {
-  // File doesn't exist.
-  ASSERT_EQ(-1, dirUnlinkHierarchy("doesntexist"));
-
-  // Nonexistent directory.
-  TemporaryDir td;
-  std::string path(td.path);
-  ASSERT_EQ(-1, dirUnlinkHierarchy((path + "/a").c_str()));
-  ASSERT_EQ(ENOENT, errno);
-}
-
-TEST(DirUtilTest, unlink_smoke) {
-  // Unlink a file.
-  TemporaryFile tf;
-  ASSERT_EQ(0, dirUnlinkHierarchy(tf.path));
-  ASSERT_EQ(-1, access(tf.path, F_OK));
-
-  TemporaryDir td;
-  std::string path(td.path);
-  constexpr mode_t mode = 0700;
-  ASSERT_EQ(0, mkdir((path + "/a").c_str(), mode));
-  ASSERT_EQ(0, mkdir((path + "/a/b").c_str(), mode));
-  ASSERT_EQ(0, mkdir((path + "/a/b/c").c_str(), mode));
-  ASSERT_EQ(0, mkdir((path + "/a/d").c_str(), mode));
-
-  // Remove "../a" recursively.
-  ASSERT_EQ(0, dirUnlinkHierarchy((path + "/a").c_str()));
-
-  // Verify it's gone.
-  ASSERT_EQ(-1, access((path + "/a").c_str(), F_OK));
-}