diff --git a/swig/CMakeLists.txt b/swig/CMakeLists.txt
index e33ff96..33d0a8c 100644
--- a/swig/CMakeLists.txt
+++ b/swig/CMakeLists.txt
@@ -34,6 +34,9 @@ include(GrPython)
 foreach(incdir ${GNURADIO_CORE_INCLUDE_DIRS})
     list(APPEND GR_SWIG_INCLUDE_DIRS ${incdir}/swig)
 endforeach(incdir)
+foreach(incdir ${GRUEL_INCLUDE_DIRS})
+    list(APPEND GR_SWIG_INCLUDE_DIRS ${incdir}/gruel/swig)
+endforeach(incdir)
 
 set(GR_SWIG_LIBRARIES air_modes)
 #set(GR_SWIG_DOC_FILE ${CMAKE_CURRENT_BINARY_DIR}/gr-air-modes_swig_doc.i)