diff --git a/recipes/mpdecimal/2.5.x/conanfile.py b/recipes/mpdecimal/2.5.x/conanfile.py
index ce8610550b172..db902a5df12f3 100644
--- a/recipes/mpdecimal/2.5.x/conanfile.py
+++ b/recipes/mpdecimal/2.5.x/conanfile.py
@@ -105,7 +105,7 @@ def generate(self):
             tc.generate()
 
             deps = AutotoolsDeps(self)
-            if is_apple_os(self) and self.settings.arch == "armv8":
+            if is_apple_os(self) and self.settings_build.arch == "armv8":
                 deps.environment.append("LDFLAGS", ["-arch arm64"])
                 deps.environment.append("LDXXFLAGS", ["-arch arm64"])
             deps.generate()