diff --git a/doc/doxygen/lwip.Doxyfile b/doc/doxygen/lwip.Doxyfile
index 5fe97184..60449efe 100644
--- a/doc/doxygen/lwip.Doxyfile
+++ b/doc/doxygen/lwip.Doxyfile
@@ -2058,7 +2058,7 @@ INCLUDE_PATH           = ../../src/include
 # used.
 # This tag requires that the tag ENABLE_PREPROCESSING is set to YES.
 
-INCLUDE_FILE_PATTERNS  = *.c *.h
+INCLUDE_FILE_PATTERNS  = *.h
 
 # The PREDEFINED tag can be used to specify one or more macro names that are
 # defined before the preprocessor is started (similar to the -D option of e.g.