--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -62,6 +62,7 @@ elseif(CMAKE_SYSTEM_PROCESSOR MATCHES ".
   message(STATUS "Using ARM fixed point math")
   option (FPM_ARM "ARM fixed point math" ON)
   if(ASO)
+    enable_language(ASM)
     target_compile_definitions(mad PRIVATE ASO_INTERLEAVE1 ASO_IMDCT)
     target_sources(mad PRIVATE imdct_l_arm.S)
   endif()