diff --git a/dub.json b/dub.json
index f318888..f2a477f 100644
--- a/dub.json
+++ b/dub.json
@@ -24,6 +24,6 @@
     "bin"
   ],
   "preGenerateCommands" : [
-    "rdmd --eval=\"auto dir=environment.get(\\\"DUB_PACKAGE_DIR\\\"); dir.buildPath(\\\"bin\\\").mkdirRecurse; auto gitVer = (\\\"git -C \\\"~dir~\\\" describe --tags\\\").executeShell; (gitVer.status == 0 ? gitVer.output.strip : \\\"v\\\" ~ dir.dirName.baseName.findSplitAfter(environment.get(\\\"DUB_ROOT_PACKAGE\\\")~\\\"-\\\")[1]).ifThrown(\\\"0.0.0\\\").chain(newline).to!string.toFile(dir.buildPath(\\\"bin\\\", \\\"dubhash.txt\\\"));\""
+    "rdmd dubhash.d"
   ]
 }
diff --git a/dubhash.d b/dubhash.d
new file mode 100644
index 0000000..7f11ca5
--- /dev/null
+++ b/dubhash.d
@@ -0,0 +1,23 @@
+import std.algorithm;
+import std.ascii;
+import std.conv;
+import std.exception;
+import std.file;
+import std.path;
+import std.process;
+import std.range;
+import std.string;
+
+void main()
+{
+    auto dir = environment.get("DUB_PACKAGE_DIR");
+    auto hashFile = dir.buildPath("bin", "dubhash.txt");
+    auto gitVer = executeShell("git -C " ~ dir ~ " describe --tags");
+    auto ver = (gitVer.status == 0 ? gitVer.output.strip
+            : "v" ~ dir.dirName.baseName.findSplitAfter(
+                environment.get("DUB_ROOT_PACKAGE") ~ "-")[1]).ifThrown("0.0.0")
+        .chain(newline).to!string.strip;
+    dir.buildPath("bin").mkdirRecurse;
+    if (!hashFile.exists || ver != hashFile.readText.strip)
+        hashFile.write(ver);
+}