diff --git a/CMakeLists.txt b/CMakeLists.txt
index bbe4d2f1e..de09a2fb2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1577,8 +1577,11 @@ endif()
 
 # TODO: - Fast huge math
 
+# Set processor-specific build macros
 if("${CMAKE_SYSTEM_PROCESSOR}" MATCHES "x86_64|AMD64")
     list(APPEND WOLFSSL_DEFINITIONS "-DWOLFSSL_X86_64_BUILD")
+elseif("${CMAKE_SYSTEM_PROCESSOR}" MATCHES "aarch64|arm64")
+    list(APPEND WOLFSSL_DEFINITIONS "-DWOLFSSL_AARCH64_BUILD")
 endif()
 
 # SP math all