diff --git a/Makefile b/Makefile
index d64f65a..bad77ef 100644
--- a/Makefile
+++ b/Makefile
@@ -26,6 +26,10 @@ ifeq (${CXX}, g++)
 	CXXFLAGS += -Wno-missing-field-initializers
 endif
 
+ifeq (${CXX}, clang++)
+	CXXFLAGS += -Wimplicit-fallthrough
+endif
+
 LDFLAGS := -s -Wl,--as-needed ${LDFLAGS}
 LDLIBS := ${shell pkg-config --libs ${GTK} ${VTE}}
 
diff --git a/termite.cc b/termite.cc
index a8def78..f7f40be 100644
--- a/termite.cc
+++ b/termite.cc
@@ -695,6 +695,7 @@ gboolean key_press_cb(VteTerminal *vte, GdkEventKey *event, keybind_info *info)
                 gtk_widget_show(info->panel.da);
                 overlay_show(&info->panel, overlay_mode::urlselect, false);
                 exit_command_mode(vte, &info->select);
+                return TRUE;
             case GDK_KEY_c:
                 vte_terminal_copy_clipboard(vte);
                 return TRUE;