diff --git a/compiler-rt/lib/builtins/assembly.h b/compiler-rt/lib/builtins/assembly.h
index d28f73f14b0cf..ac119af521a37 100644
--- a/compiler-rt/lib/builtins/assembly.h
+++ b/compiler-rt/lib/builtins/assembly.h
@@ -337,7 +337,8 @@
 #endif
 #endif
 
-#if defined(__ASSEMBLER__) && (defined(__i386__) || defined(__amd64__))
+#if defined(__ASSEMBLER__) && (defined(__i386__) || defined(__amd64__)) &&     \
+    !defined(__arm64ec__)
 .att_syntax
 #endif