diff --git a/pkgs/by-name/cm/cmake/009-cmCTestCurl-Avoid-using-undocumented-type-for-CURLOPT_PROXYTYPE-values.diff b/pkgs/by-name/cm/cmake/009-cmCTestCurl-Avoid-using-undocumented-type-for-CURLOPT_PROXYTYPE-values.diff
new file mode 100644
index 000000000000..feabba28b0d6
--- /dev/null
+++ b/pkgs/by-name/cm/cmake/009-cmCTestCurl-Avoid-using-undocumented-type-for-CURLOPT_PROXYTYPE-values.diff
@@ -0,0 +1,13 @@
+diff --git a/Source/CTest/cmCTestCurl.h b/Source/CTest/cmCTestCurl.h
+index 7836f4b9c78a1d103eee515d618856a6712b4480..9113890b5a12cb157b691b66d96e25d0fd4b50ef 100644
+--- a/Source/CTest/cmCTestCurl.h
++++ b/Source/CTest/cmCTestCurl.h
+@@ -52,7 +52,7 @@ private:
+   std::vector<std::string> HttpHeaders;
+   std::string HTTPProxyAuth;
+   std::string HTTPProxy;
+-  curl_proxytype HTTPProxyType;
++  long HTTPProxyType;
+   bool UseHttp10 = false;
+   bool Quiet = false;
+   int TimeOutSeconds = 0;
diff --git a/pkgs/by-name/cm/cmake/package.nix b/pkgs/by-name/cm/cmake/package.nix
index 8f2f690f90aa..32b00795f366 100644
--- a/pkgs/by-name/cm/cmake/package.nix
+++ b/pkgs/by-name/cm/cmake/package.nix
@@ -75,6 +75,9 @@ stdenv.mkDerivation (finalAttrs: {
     # Backport of https://gitlab.kitware.com/cmake/cmake/-/merge_requests/9900
     # Needed to correctly link curl in pkgsStatic.
     ./008-FindCURL-Add-more-target-properties-from-pkg-config.diff
+    # Backport of https://gitlab.kitware.com/cmake/cmake/-/merge_requests/11134
+    # Fixes build against curl 8.16 and later
+    ./009-cmCTestCurl-Avoid-using-undocumented-type-for-CURLOPT_PROXYTYPE-values.diff
   ];
 
   outputs = [