diff --git a/gobject/gobject.c b/gobject/gobject.c
index 6ab662eaa..863d5b67a 100644
--- a/gobject/gobject.c
+++ b/gobject/gobject.c
@@ -749,7 +749,7 @@ g_object_class_install_properties (GObjectClass  *oclass,
                                    GParamSpec   **pspecs)
 {
   GType oclass_type, parent_type;
-  gint i;
+  guint i;
 
   g_return_if_fail (G_IS_OBJECT_CLASS (oclass));
   g_return_if_fail (n_pspecs > 1);
@@ -1798,7 +1798,7 @@ g_object_new_with_custom_constructor (GObjectClass          *class,
   gint n_cparams;
   gint cvals_used;
   GSList *node;
-  gint i;
+  guint i;
 
   /* If we have ->constructed() then we have to do a lot more work.
    * It's possible that this is a singleton and it's also possible
@@ -1828,7 +1828,7 @@ g_object_new_with_custom_constructor (GObjectClass          *class,
     {
       GParamSpec *pspec;
       GValue *value;
-      gint j;
+      guint j;
 
       pspec = node->data;
       value = NULL; /* to silence gcc... */
@@ -1954,7 +1954,7 @@ g_object_new_internal (GObjectClass          *class,
         {
           const GValue *value;
           GParamSpec *pspec;
-          gint j;
+          guint j;
 
           pspec = node->data;
           value = NULL; /* to silence gcc... */
@@ -1980,7 +1980,7 @@ g_object_new_internal (GObjectClass          *class,
 
   if (nqueue)
     {
-      gint i;
+      guint i;
 
       /* Set remaining properties.  The construct properties will
        * already have been taken, so set only the non-construct
diff --git a/gobject/gtype.c b/gobject/gtype.c
index 69cd27512..f83c1caee 100644
--- a/gobject/gtype.c
+++ b/gobject/gtype.c
@@ -579,7 +579,7 @@ lookup_iface_entry_I (IFaceEntries *entries,
   guint8 *offsets;
   guint offset_index;
   IFaceEntry *check;
-  int index;
+  gsize index;
   IFaceEntry *entry;
 
   if (entries == NULL)
@@ -1369,7 +1369,7 @@ type_node_add_iface_entry_W (TypeNode   *node,
   IFaceEntry *entry;
   TypeNode *iface_node;
   guint i, j;
-  int num_entries;
+  guint num_entries;
 
   g_assert (node->is_instantiatable);
 
@@ -1608,7 +1608,7 @@ g_type_interface_add_prerequisite (GType interface_type,
 	    }
 	}
       
-      for (i = 0; i < prerequisite_node->n_supers + 1; i++)
+      for (i = 0; i < prerequisite_node->n_supers + 1u; i++)
 	type_iface_add_prerequisite_W (iface, lookup_type_node_I (prerequisite_node->supers[i]));
       G_WRITE_UNLOCK (&type_rw_lock);
     }