diff --git a/CMakeLists.txt b/CMakeLists.txt
index 13e66268..27ff8364 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -137,7 +137,7 @@ set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/bin )
 
 if(CMAKE_BUILD_TYPE)
     # Validate build type
-    set(CONFIGURATION_TYPES "Debug;Release;RelWithDebInfo")
+    set(CONFIGURATION_TYPES "Debug;Release;RelWithDebInfo;Gentoo")
 
     string(FIND "${CONFIGURATION_TYPES}" "${CMAKE_BUILD_TYPE}" MATCHED_CONFIG)
     if (${MATCHED_CONFIG} EQUAL -1)