diff --git a/npa/Doxyfile.in b/npa/Doxyfile.in
index 3b405ba..ed5e863 100644
--- a/npa/Doxyfile.in
+++ b/npa/Doxyfile.in
@@ -3,7 +3,7 @@ PROJECT_NUMBER         = @PACKAGE_VERSION@
 OUTPUT_DIRECTORY       = @builddir@/doc
 STRIP_FROM_PATH        = @top_srcdir@/src
 INPUT                  = @top_srcdir@/src 
-FILE_PATTERNS          = *.c *.h
+FILE_PATTERNS          = *.h
 RECURSIVE              = YES
 EXAMPLE_PATH           = @top_srcdir@/src
 GENERATE_HTML          = YES