diff --git a/BuildAll.py b/BuildAll.py
index 9af0521d..297e1bc3 100644
--- a/BuildAll.py
+++ b/BuildAll.py
@@ -224,7 +224,7 @@ def Build(hostPlatform, hostArch, buildSys, compiler, arch, configuration, tblge
 		hostArch = "x64"
 	elif (hostArch == "i386"):
 		hostArch = "x86"
-	elif (hostArch == "ARM64"):
+	elif (hostArch.lower() == "arm64"):
 		hostArch = "arm64"
 	else:
 		LogError("Unknown host architecture %s.\n" % hostArch)