diff --git a/CMakeLists.txt b/CMakeLists.txt
index 12945aee..b1e16381 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -23,24 +23,24 @@ else()
       "${CMAKE_CXX_FLAGS} -std=c++11 -Wall -Wpedantic")
 endif()
 
-if (${VARIANT} STREQUAL "coverage")
+if ("${VARIANT}" STREQUAL "coverage")
     set(CMAKE_CXX_FLAGS
       "${CMAKE_CXX_FLAGS} -fprofile-arcs -ftest-coverage")
     set(CMAKE_BUILD_TYPE RELWITHDEBINFO)
     set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -lgcov")
-elseif (${VARIANT} STREQUAL "asan")
+elseif ("${VARIANT}" STREQUAL "asan")
     set(CMAKE_CXX_FLAGS
       "${CMAKE_CXX_FLAGS} -fsanitize=address -fno-omit-frame-pointer")
     set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -fsanitize=address")
     set(CMAKE_BUILD_TYPE RELWITHDEBINFO)
-elseif (${VARIANT} STREQUAL "usan")
+elseif ("${VARIANT}" STREQUAL "usan")
     set(CMAKE_CXX_FLAGS
       "${CMAKE_CXX_FLAGS} -fsanitize=undefined -fno-omit-frame-pointer")
     set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -fsanitize=undefined")
     set(CMAKE_BUILD_TYPE RELWITHDEBINFO)
-elseif (${VARIANT} STREQUAL "debug")
+elseif ("${VARIANT}" STREQUAL "debug")
     set(CMAKE_BUILD_TYPE DEBUG)
-elseif (${VARIANT} STREQUAL "release")
+elseif ("${VARIANT}" STREQUAL "release")
     set(CMAKE_BUILD_TYPE RELEASE)
 endif()