Index: lib/Target/AArch64/MCTargetDesc/AArch64MCAsmInfo.cpp
===================================================================
--- lib/Target/AArch64/MCTargetDesc/AArch64MCAsmInfo.cpp
+++ lib/Target/AArch64/MCTargetDesc/AArch64MCAsmInfo.cpp
@@ -105,4 +105,5 @@
   CommentString = ";";
   PrivateGlobalPrefix = ".L";
   PrivateLabelPrefix = ".L";
+  AlignmentIsInBytes = false;
 }
Index: test/MC/COFF/aarch64-align.s
===================================================================
--- /dev/null
+++ test/MC/COFF/aarch64-align.s
@@ -0,0 +1,7 @@
+// RUN: llvm-mc -filetype=obj -triple aarch64-windows-gnu %s | llvm-readobj -s -sd | FileCheck %s
+    .text
+    .align 5
+f0:
+    ret
+
+// CHECK: IMAGE_SCN_ALIGN_32BYTES