diff --git a/indra/cmake/LLWindow.cmake b/indra/cmake/LLWindow.cmake
index 1b0370cc14..58b842f4b5 100644
--- a/indra/cmake/LLWindow.cmake
+++ b/indra/cmake/LLWindow.cmake
@@ -18,7 +18,7 @@ if (USESYSTEMLIBS)
       )
 else (USESYSTEMLIBS)
   if (LINUX)
-    if( NOT USE_SDL2 )
+    if( USE_SDL1 )
       use_prebuilt_binary(SDL)
       set (SDL_FOUND TRUE)
 	  
diff --git a/indra/llwindow/CMakeLists.txt b/indra/llwindow/CMakeLists.txt
index 299a434d76..69beec1c19 100644
--- a/indra/llwindow/CMakeLists.txt
+++ b/indra/llwindow/CMakeLists.txt
@@ -81,7 +81,7 @@ if (LINUX)
       libfreetype.a
       )
 
-  if( NOT USE_SDL2 )
+  if( USE_SDL1 )
     list(APPEND viewer_SOURCE_FILES
             llkeyboardsdl.cpp
             llwindowsdl.cpp