diff --git a/packages/flutter_tools/lib/src/base/os.dart b/packages/flutter_tools/lib/src/base/os.dart
index 1ce1951cef..1bd7602318 100644
--- a/packages/flutter_tools/lib/src/base/os.dart
+++ b/packages/flutter_tools/lib/src/base/os.dart
@@ -260,7 +260,15 @@ class _PosixUtils extends OperatingSystemUtils {
   @override
   String get pathVarSeparator => ':';
 
-  HostPlatform? _hostPlatform;
+  // uname outputs build platform characteristics, not host platform characteristics.
+  // _MacOSUtils uses sysctl instead, which is still incorrect.
+  HostPlatform? _hostPlatform = switch (const String.fromEnvironment('NIX_FLUTTER_HOST_PLATFORM')) {
+    'x86_64-linux' => HostPlatform.linux_x64,
+    'aarch64-linux' => HostPlatform.linux_arm64,
+    'x86_64-darwin' => HostPlatform.darwin_x64,
+    'aarch64-darwin' => HostPlatform.darwin_arm64,
+    String value => throw ArgumentError.value(value, 'NIX_FLUTTER_HOST_PLATFORM', 'Unknown Nix host platform!'),
+  };
 
   @override
   HostPlatform get hostPlatform {