diff --git a/libunwind/src/CMakeLists.txt b/libunwind/src/CMakeLists.txt
--- a/libunwind/src/CMakeLists.txt
+++ b/libunwind/src/CMakeLists.txt
@@ -24,9 +24,6 @@
     UnwindRegistersRestore.S
     UnwindRegistersSave.S
     )
-set_source_files_properties(${LIBUNWIND_ASM_SOURCES}
-                            PROPERTIES
-                              LANGUAGE C)
 
 set(LIBUNWIND_HEADERS
     AddressSpace.hpp