diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3e382a4..63ef346 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -57,11 +57,11 @@ set(PROCESSOR_IS_RISCV FALSE)
 
 if(CMAKE_SYSTEM_PROCESSOR MATCHES "^mips")
   set(PROCESSOR_IS_MIPS TRUE)
-elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(aarch64|arm64)")
+elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(aarch64|arm64|ARM64)")
   set(PROCESSOR_IS_AARCH64 TRUE)
 elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^arm")
   set(PROCESSOR_IS_ARM TRUE)
-elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "(x86_64)|(AMD64|amd64)|(^i.86$)")
+elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "(x86)|(x86_64)|(AMD64|amd64)|(^i.86$)")
   set(PROCESSOR_IS_X86 TRUE)
 elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(powerpc|ppc)")
   set(PROCESSOR_IS_POWER TRUE)