diff --git a/cmake/CheckIPO.cmake b/cmake/CheckIPO.cmake
index 38c1dad1..ca0763a0 100644
--- a/cmake/CheckIPO.cmake
+++ b/cmake/CheckIPO.cmake
@@ -2,7 +2,7 @@
 include (CheckIPOSupported)
 check_ipo_supported (RESULT result OUTPUT output)
 
-if (result AND ENABLE_LTO AND ${CMAKE_BUILD_TYPE} STREQUAL "Release")
+if (${result} AND ${ENABLE_LTO} AND ${CMAKE_BUILD_TYPE} STREQUAL "Release")
     message (STATUS "\nLTO enabled.")
 else()
     if (${output})
@@ -13,8 +13,8 @@ else()
     set (ENABLE_LTO OFF)
 endif()
 
-function(SFIZZ_ENABLE_LTO_IF_NEEDED TARGET)
-    if (ENABLE_LTO)
+function (SFIZZ_ENABLE_LTO_IF_NEEDED TARGET)
+    if (${ENABLE_LTO})
         message(STATUS "Enabling LTO on ${TARGET}")
         set_property (TARGET ${TARGET} PROPERTY INTERPROCEDURAL_OPTIMIZATION True)
     endif()