diff --git a/lib/Target/ARM/AsmParser/CMakeLists.txt b/lib/Target/ARM/AsmParser/CMakeLists.txt
index 308c6cff8da..9ba7c0125d7 100644
--- a/lib/Target/ARM/AsmParser/CMakeLists.txt
+++ b/lib/Target/ARM/AsmParser/CMakeLists.txt
@@ -1,6 +1,7 @@
 include_directories( ${CMAKE_CURRENT_BINARY_DIR}/.. ${CMAKE_CURRENT_SOURCE_DIR}/.. )
 
 add_llvm_library(LLVMARMAsmParser
+  ARMAsmLexer.cpp
   ARMAsmParser.cpp
   )