diff --git a/CMakeLists.txt b/CMakeLists.txt
index 37f8b9541a0dbaee86e277370fb61ebd87e6bbdf..0f73bf02821027fb813b9af6cab9e29880811b6f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -22,6 +22,12 @@ if( NOT DEFINED ITA_VA_BUILD_STATIC )
 	set( ITA_VA_BUILD_STATIC OFF CACHE BOOL "Build static VA libs" )
 endif( )
 
+if( NOT DEFINED ITA_VA_CORE_LIBS_FFT_USES_FFTW3 )
+	set( ITA_VA_CORE_LIBS_FFT_USES_FFTW3 ON CACHE BOOL "If ITAFFT library of ITACoreLibs uses FFTW3, VACore has to fall back to GNU GPL license." )
+	set( ITA_VA_COPYING_GNU_GPL ON PARENT_SCOPE )
+endif( )
+
+
 if( NOT DEFINED ITA_VACORE_DEPLOY_WITH_COMMON_DATA )
 	set( ITA_VACORE_DEPLOY_WITH_COMMON_DATA ON CACHE BOOL "Will deploy VACore with common data (HRIR, Directivity, WAV file, HPEQ, Room Model, etc)" )
 endif( )