diff --git a/Findptu_d46.cmake b/Findptu_d46.cmake
index 94406c197eaa730117c935fd2d879d4aa6568cfb..b1d8c33f358ffa107e97a3d7dbbf534b95f38177 100755
--- a/Findptu_d46.cmake
+++ b/Findptu_d46.cmake
@@ -1,5 +1,5 @@
 #edit the following line to add the librarie's header files
-FIND_PATH(ptu_d46_INCLUDE_DIRS ptu_commands.h ptu_d46.h /usr/include/iri/ptu_d46 /usr/local/include/iri/ptu_d46)
+FIND_PATH(ptu_d46_INCLUDE_DIRS ptu_commands.h ptu_d46.h ptu_d46_exceptions.h /usr/include/iri/ptu_d46 /usr/local/include/iri/ptu_d46)
 
 FIND_LIBRARY(ptu_d46_LIBRARIES
     NAMES ptu_d46