diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7370f40d..0595159c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -38,18 +38,18 @@ if(NOT CMAKE_BUILD_TYPE)
 endif(NOT CMAKE_BUILD_TYPE)
 
 # Enable LTO if we're in a release build and LTO is supported
-include(CheckIPOSupported)
-check_ipo_supported(RESULT LTO_SUPPORTED OUTPUT error)
-if(LTO_SUPPORTED)
-    string(TOUPPER ${CMAKE_BUILD_TYPE} _CMAKE_BUILD_TYPE_UPPER)
-    if (_CMAKE_BUILD_TYPE_UPPER STREQUAL "DEBUG")
-        message(STATUS "LTO disabled because we're in a debug build")
-    else()
+string(TOUPPER ${CMAKE_BUILD_TYPE} _CMAKE_BUILD_TYPE_UPPER)
+if (_CMAKE_BUILD_TYPE_UPPER STREQUAL "DEBUG")
+    message(STATUS "LTO disabled because we're in a debug build")
+else()
+    include(CheckIPOSupported)
+    check_ipo_supported(RESULT LTO_SUPPORTED OUTPUT error)
+    if(LTO_SUPPORTED)
         message(STATUS "LTO enabled")
         set(CMAKE_INTERPROCEDURAL_OPTIMIZATION TRUE)
+    else()
+        message(WARNING "LTO disabled because compiler does not support it.")
     endif()
-else()
-    message(WARNING "LTO disabled because compiler does not support it.")
 endif()
 
 if(USE_CLANG_TIDY)