diff --git a/src/python/pychm/recollchm/extra.c b/src/python/pychm/recollchm/extra.c
index ff999b64..3864d53c 100644
--- a/src/python/pychm/recollchm/extra.c
+++ b/src/python/pychm/recollchm/extra.c
@@ -599,7 +599,7 @@ chm_get_lcid (struct chmFile *chmfile) {
   uint32_t lang;
   int i;
 
-  for (i=0; i<LANG_FILES_SIZE; i++) {
+  for (i=0; i<(int)LANG_FILES_SIZE; i++) {
 
     if (chm_resolve_object (chmfile, lang_files[i].file, &ui) ==
         CHM_RESOLVE_SUCCESS) {
diff --git a/src/qtgui/rclmain_w.cpp b/src/qtgui/rclmain_w.cpp
index 909d121d..57d2fae0 100644
--- a/src/qtgui/rclmain_w.cpp
+++ b/src/qtgui/rclmain_w.cpp
@@ -497,7 +497,12 @@ void RclMain::setupCategoryFiltering()
         m_filtMN->connect(m_filtMN, SIGNAL(triggered(QAction *)), this, 
                           SLOT(catgFilter(QAction *)));
     }
-    connect(m_filtBGRP, SIGNAL(buttonClicked(int)),this, SLOT(catgFilter(int)));
+
+#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
+    connect(m_filtBGRP, SIGNAL(idClicked(int)), this, SLOT(catgFilter(int)));
+#else
+    connect(m_filtBGRP, SIGNAL(buttonClicked(int)), this, SLOT(catgFilter(int)));
+#endif
     connect(m_filtCMB, SIGNAL(activated(int)), this, SLOT(catgFilter(int)));
 }