diff --git a/ft8/CMakeLists.txt b/ft8/CMakeLists.txt
index 3aaf42564..6d49acaeb 100644
--- a/ft8/CMakeLists.txt
+++ b/ft8/CMakeLists.txt
@@ -19,6 +19,7 @@ set(ft8_HEADERS
 )
 
 include_directories(
+    ${FFTW3F_INCLUDE_DIRS}
     ${CMAKE_SOURCE_DIR}/exports
     ${CMAKE_SOURCE_DIR}/sdrbase
 )