diff --git a/moo/mooedit/mootextbtree.c b/moo/mooedit/mootextbtree.c
index 123fbced..d56f325f 100644
--- a/moo/mooedit/mootextbtree.c
+++ b/moo/mooedit/mootextbtree.c
@@ -322,7 +322,7 @@ static void
 merge_nodes (BTNode *parent, guint first)
 {
     BTNode *node, *next;
-    int i;
+    guint i;
 
     g_assert (first + 1 < parent->n_children);
 
diff --git a/moo/moolua/lua/luaall.cpp b/moo/moolua/lua/luaall.cpp
index 04ae6622..4766e750 100644
--- a/moo/moolua/lua/luaall.cpp
+++ b/moo/moolua/lua/luaall.cpp
@@ -2,9 +2,11 @@
 * all.c -- Lua core, libraries and interpreter in a single file
 */
 
+#ifdef __GNUC__
 #pragma GCC diagnostic ignored "-Wimplicit-fallthrough"
 #pragma GCC diagnostic ignored "-Wsign-compare"
 #pragma GCC diagnostic ignored "-Wmisleading-indentation"
+#endif
 
 #define luaall_c