diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -382,6 +382,7 @@
 	util/bip32.cpp
 	util/bytevectorhash.cpp
 	util/error.cpp
+	util/getuniquepath.cpp
 	util/message.cpp
 	util/moneystr.cpp
 	util/readwritefile.cpp
diff --git a/src/test/fs_tests.cpp b/src/test/fs_tests.cpp
--- a/src/test/fs_tests.cpp
+++ b/src/test/fs_tests.cpp
@@ -4,6 +4,7 @@
 //
 #include <fs.h>
 
+#include <util/getuniquepath.h>
 #include <util/system.h>
 
 #include <test/util/setup_common.h>
@@ -84,6 +85,21 @@
         file >> input_buffer;
         BOOST_CHECK_EQUAL(input_buffer, "bitcoin");
     }
+    {
+        fs::path p1 = GetUniquePath(tmpfolder);
+        fs::path p2 = GetUniquePath(tmpfolder);
+        fs::path p3 = GetUniquePath(tmpfolder);
+
+        // Ensure that the parent path is always the same.
+        BOOST_CHECK_EQUAL(tmpfolder, p1.parent_path());
+        BOOST_CHECK_EQUAL(tmpfolder, p2.parent_path());
+        BOOST_CHECK_EQUAL(tmpfolder, p3.parent_path());
+
+        // Ensure that generated paths are actually different.
+        BOOST_CHECK(p1 != p2);
+        BOOST_CHECK(p2 != p3);
+        BOOST_CHECK(p1 != p3);
+    }
 }
 
 BOOST_AUTO_TEST_SUITE_END()
diff --git a/src/test/util_tests.cpp b/src/test/util_tests.cpp
--- a/src/test/util_tests.cpp
+++ b/src/test/util_tests.cpp
@@ -13,6 +13,7 @@
 #include <test/util/str.h>
 #include <uint256.h>
 #include <util/check.h>
+#include <util/getuniquepath.h>
 #include <util/message.h> // For MessageSign(), MessageVerify(), MESSAGE_MAGIC
 #include <util/moneystr.h>
 #include <util/spanparsing.h>
@@ -2188,7 +2189,7 @@
     BOOST_CHECK_EQUAL(DirIsWritable(tmpdirname), true);
 
     // Should not be able to write to a non-existent dir.
-    tmpdirname = tmpdirname / fs::unique_path();
+    tmpdirname = GetUniquePath(tmpdirname);
     BOOST_CHECK_EQUAL(DirIsWritable(tmpdirname), false);
 
     fs::create_directory(tmpdirname);
diff --git a/src/util/getuniquepath.h b/src/util/getuniquepath.h
new file mode 100644
--- /dev/null
+++ b/src/util/getuniquepath.h
@@ -0,0 +1,19 @@
+// Copyright (c) 2021 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_UTIL_GETUNIQUEPATH_H
+#define BITCOIN_UTIL_GETUNIQUEPATH_H
+
+#include <fs.h>
+
+/**
+ * Helper function for getting a unique path
+ *
+ * @param[in] base  Base path
+ * @returns base joined with a random 8-character long string.
+ * @post Returned path is unique with high probability.
+ */
+fs::path GetUniquePath(const fs::path &base);
+
+#endif // BITCOIN_UTIL_GETUNIQUEPATH_H
diff --git a/src/util/getuniquepath.cpp b/src/util/getuniquepath.cpp
new file mode 100644
--- /dev/null
+++ b/src/util/getuniquepath.cpp
@@ -0,0 +1,9 @@
+#include <fs.h>
+#include <random.h>
+#include <util/strencodings.h>
+
+fs::path GetUniquePath(const fs::path &base) {
+    FastRandomContext rnd;
+    fs::path tmpFile = base / HexStr(rnd.randbytes(8));
+    return tmpFile;
+}
diff --git a/src/util/system.cpp b/src/util/system.cpp
--- a/src/util/system.cpp
+++ b/src/util/system.cpp
@@ -7,6 +7,7 @@
 
 #include <chainparamsbase.h>
 #include <sync.h>
+#include <util/getuniquepath.h>
 #include <util/strencodings.h>
 #include <util/string.h>
 #include <util/translation.h>
@@ -125,7 +126,7 @@
 }
 
 bool DirIsWritable(const fs::path &directory) {
-    fs::path tmpFile = directory / fs::unique_path();
+    fs::path tmpFile = GetUniquePath(directory);
 
     FILE *file = fsbridge::fopen(tmpFile, "a");
     if (!file) {