diff --git a/Finddynamixel_pan_tilt.cmake b/Finddynamixel_pan_tilt.cmake
index 82281b2756753410459ea64868c56d15b2e2cc3e..1cacb48f7e0abed127ee3b4ff1a1ccd3b9df0d73 100644
--- a/Finddynamixel_pan_tilt.cmake
+++ b/Finddynamixel_pan_tilt.cmake
@@ -1,5 +1,5 @@
 #edit the following line to add the librarie's header files
-FIND_PATH(dynamixel_pan_tilt_INCLUDE_DIR dynamixel_pan_tilt.h /usr/include/iridrivers /usr/local/include/iridrivers)
+FIND_PATH(dynamixel_pan_tilt_INCLUDE_DIR dynamixel_pan_tilt.h dynamixel_pan_tilt_exceptions.h /usr/include/iridrivers /usr/local/include/iridrivers)
 
 FIND_LIBRARY(dynamixel_pan_tilt_LIBRARY
     NAMES dynamixel_pan_tilt