diff --git a/CMakeLists.txt b/CMakeLists.txt
index 18fd92e..3be8b9e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -32,6 +32,7 @@ add_definitions(-Wall -Wno-deprecated-register -std=c++0x -DYYDEBUG=0 -O2)
 
 bison_target(Parser Monicelli.ypp ${CMAKE_CURRENT_BINARY_DIR}/Parser.cpp)
 flex_target(Scanner Monicelli.lpp ${CMAKE_CURRENT_BINARY_DIR}/Lexer.cpp)
+add_flex_bison_dependency(Scanner Parser)
 
 add_executable(
     mcc