diff --git a/compiler-rt/lib/builtins/arm/sync-ops.h b/compiler-rt/lib/builtins/arm/sync-ops.h
--- a/compiler-rt/lib/builtins/arm/sync-ops.h
+++ b/compiler-rt/lib/builtins/arm/sync-ops.h
@@ -16,9 +16,8 @@
 
 #define SYNC_OP_4(op)                                                          \
   .p2align 2;                                                                  \
-  .thumb;                                                                      \
   .syntax unified;                                                             \
-  DEFINE_COMPILERRT_THUMB_FUNCTION(__sync_fetch_and_##op)                      \
+  DEFINE_COMPILERRT_FUNCTION(__sync_fetch_and_##op)                            \
   DMB;                                                                         \
   mov r12, r0;                                                                 \
   LOCAL_LABEL(tryatomic_##op) : ldrex r0, [r12];                               \
@@ -31,9 +30,8 @@
 
 #define SYNC_OP_8(op)                                                          \
   .p2align 2;                                                                  \
-  .thumb;                                                                      \
   .syntax unified;                                                             \
-  DEFINE_COMPILERRT_THUMB_FUNCTION(__sync_fetch_and_##op)                      \
+  DEFINE_COMPILERRT_FUNCTION(__sync_fetch_and_##op)                            \
   push {r4, r5, r6, lr};                                                       \
   DMB;                                                                         \
   mov r12, r0;                                                                 \