diff --git a/Cabal/src/Distribution/Simple/PreProcess.hs b/Cabal/src/Distribution/Simple/PreProcess.hs
index 6945dd58ae9..a8fa649aef2 100644
--- a/Cabal/src/Distribution/Simple/PreProcess.hs
+++ b/Cabal/src/Distribution/Simple/PreProcess.hs
@@ -794,7 +794,7 @@ platformDefines lbi =
       Android -> ["android"]
       Ghcjs -> ["ghcjs"]
       Wasi -> ["wasi"]
-      Hurd -> ["hurd"]
+      Hurd -> ["gnu"]
       Haiku -> ["haiku"]
       OtherOS _ -> []
     archStr = case hostArch of
diff --git a/changelog.d/pr-11401 b/changelog.d/pr-11401
new file mode 100644
index 00000000000..37573b337bc
--- /dev/null
+++ b/changelog.d/pr-11401
@@ -0,0 +1,12 @@
+synopsis: Fix the OS string encoding for GNU/Hurd
+packages: Cabal
+prs: #11401
+
+description: {
+
+Following [#9434](https://github.com/haskell/cabal/pull/9434/), and as seen
+in the various `gnu_HOST_OS` uses in the GHC source code, it is expected that
+GNU/Hurd is advertised as "gnu", so the OS String encoding for OSHurd was
+corrected to "gnu".
+
+}