diff --git a/runastyle b/runastyle
index 6bfc83ac2fe..82c91d5f7b9 100755
--- a/runastyle
+++ b/runastyle
@@ -31,7 +31,7 @@ astyle $style $options tools/*.cpp
 astyle $style $options --recursive "samples/*.c"
 astyle $style $options --recursive "samples/*.cpp"
 
-astyle $style $options htdocs/archive/*.cpp
+astyle $style $options htdocs/archive/*.c
 astyle $style $options htdocs/archive/*.h
 
 # Convert tabs to spaces.. even in strings
diff --git a/runastyle.bat b/runastyle.bat
index 7c7a67b3ce2..61346895129 100644
--- a/runastyle.bat
+++ b/runastyle.bat
@@ -16,5 +16,5 @@ astyle %STYLE% %OPTIONS% test/*.h
 
 astyle %STYLE% %OPTIONS% tools/*.cpp
 
-astyle %STYLE% %OPTIONS% htdocs/archive/*.cpp
+astyle %STYLE% %OPTIONS% htdocs/archive/*.c
 astyle %STYLE% %OPTIONS% htdocs/archive/*.h