diff --git a/acinclude.m4 b/acinclude.m4
index ef68711..76bd0b0 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -1976,7 +1976,7 @@ cat > conftest.$ac_ext <<EOF
 #endif
 #include <stdio.h>
 #include "confdefs.h"
-#include <kapp.h>
+#include <tdeapplication.h>
 
 int main() {
     printf("kde_htmldir=\\"%s\\"\n", TDEApplication::kde_htmldir().data());