diff --git a/CMakeLists.txt b/CMakeLists.txt
index 165f6d7..09234f7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -36,7 +36,7 @@ else()
     find_package(Boost 1.53.0 COMPONENTS system thread REQUIRED)
     target_link_libraries(simple-web-server INTERFACE ${Boost_LIBRARIES})
     target_include_directories(simple-web-server INTERFACE ${Boost_INCLUDE_DIR})
-    if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.9)
+    if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU" AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.9)
         target_compile_definitions(simple-web-server INTERFACE USE_BOOST_REGEX)
         find_package(Boost 1.53.0 COMPONENTS regex REQUIRED)
         target_link_libraries(simple-web-server INTERFACE ${Boost_LIBRARIES})
@@ -60,7 +60,7 @@ if(OPENSSL_FOUND)
 endif()
 
 # If Simple-Web-Server is not a sub-project:
-if("${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_CURRENT_SOURCE_DIR}")
+if(CMAKE_SOURCE_DIR STREQUAL "${CMAKE_CURRENT_SOURCE_DIR}")
     find_package(Boost 1.53.0 COMPONENTS system thread filesystem)
     if(Boost_FOUND)
         add_executable(http_examples http_examples.cpp)