diff --git a/doc/rt/Doxyfile_html b/doc/rt/Doxyfile_html
index f1f65de62..5f0a2e810 100644
--- a/doc/rt/Doxyfile_html
+++ b/doc/rt/Doxyfile_html
@@ -1023,7 +1023,7 @@ GENERATE_HTMLHELP      = NO
 # can add a path in front of the file if the result should not be
 # written to the html output directory.
 
-CHM_FILE               = ../ChibiOS_RT.chm
+CHM_FILE               = ../../ChibiOS_RT.chm
 
 # If the GENERATE_HTMLHELP tag is set to YES, the HHC_LOCATION tag can
 # be used to specify the location (absolute path including file name) of