diff --git a/lib/libcompiler_rt/Makefile.inc b/lib/libcompiler_rt/Makefile.inc
index 10797e93e63b..aa0a6a6c9e69 100644
--- a/lib/libcompiler_rt/Makefile.inc
+++ b/lib/libcompiler_rt/Makefile.inc
@@ -124,7 +124,8 @@ SRCF+=		umodti3
 
 # Enable compiler-rt's atomic implementation only for clang, as it uses clang
 # specific builtins, and gcc packages usually come with their own libatomic.
-.if "${COMPILER_TYPE}" == "clang"
+# Exclude arm which has its own implementations of atomic functions, below.
+.if "${COMPILER_TYPE}" == "clang" && ${MACHINE_CPUARCH} != "arm"
 SRCF+=		atomic
 .endif