diff --git a/flake.nix b/flake.nix
index 3dc9b3ac3..79ac9caea 100644
--- a/flake.nix
+++ b/flake.nix
@@ -408,9 +408,10 @@
                       pkgs.buildPackages.meson
                       pkgs.buildPackages.ninja
                       pkgs.buildPackages.cmake
-
-                      pkgs.buildPackages.clangbuildanalyzer
-                    ];
+                    ]
+                    ++
+                      lib.optionals (lib.meta.availableOn pkgs.stdenv.hostPlatform pkgs.buildPackages.clangbuildanalyzer)
+                        [ pkgs.buildPackages.clangbuildanalyzer ];
 
                   src = null;
 
diff --git a/misc/clangbuildanalyzer.nix b/misc/clangbuildanalyzer.nix
index cee8a0d77..d73fa8bbb 100644
--- a/misc/clangbuildanalyzer.nix
+++ b/misc/clangbuildanalyzer.nix
@@ -25,6 +25,9 @@ stdenv.mkDerivation (finalAttrs: {
     maintainers = with lib.maintainers; [ lf- ];
     license = lib.licenses.unlicense;
     platforms = lib.platforms.unix;
+    # `long long int` != `size_t`
+    # There's no convenient lib.platforms.32bit or anything, but it's easy enough to do ourselves.
+    badPlatforms = lib.filter (plat: (lib.systems.elaborate plat).is32bit) lib.platforms.all;
     mainProgram = "ClangBuildAnalyzer";
   };
 })