diff --git a/doc/doxygen/openvpn.doxyfile.in b/doc/doxygen/openvpn.doxyfile.in
index 573b7c2..edecc54 100644
--- a/doc/doxygen/openvpn.doxyfile.in
+++ b/doc/doxygen/openvpn.doxyfile.in
@@ -894,36 +894,7 @@
 # *.ucf, *.qsf and *.ice.
 
 FILE_PATTERNS          = *.c \
-                         *.cc \
-                         *.cxx \
-                         *.cpp \
-                         *.c++ \
-                         *.d \
-                         *.java \
-                         *.ii \
-                         *.ixx \
-                         *.ipp \
-                         *.i++ \
-                         *.inl \
-                         *.h \
-                         *.hh \
-                         *.hxx \
-                         *.hpp \
-                         *.h++ \
-                         *.idl \
-                         *.odl \
-                         *.cs \
-                         *.php \
-                         *.php3 \
-                         *.inc \
-                         *.m \
-                         *.mm \
-                         *.dox \
-                         *.py \
-                         *.f90 \
-                         *.f \
-                         *.vhd \
-                         *.vhdl
+                         *.h
 
 # The RECURSIVE tag can be used to specify whether or not subdirectories should
 # be searched for input files as well.