diff --git a/girepository/givfuncinfo.c b/girepository/givfuncinfo.c
index b581c1782..4c4b0d315 100644
--- a/girepository/givfuncinfo.c
+++ b/girepository/givfuncinfo.c
@@ -120,7 +120,7 @@ gi_vfunc_info_get_flags (GIVFuncInfo *info)
  * Returns: the struct offset or `0xFFFF` if it’s unknown
  * Since: 2.80
  */
-gint
+guint
 gi_vfunc_info_get_offset (GIVFuncInfo *info)
 {
   GIRealInfo *rinfo = (GIRealInfo *)info;
@@ -336,9 +336,9 @@ gboolean
 gi_vfunc_info_invoke (GIVFuncInfo      *info,
                       GType             implementor,
                       const GIArgument *in_args,
-                      int               n_in_args,
+                      gsize             n_in_args,
                       const GIArgument *out_args,
-                      int               n_out_args,
+                      gsize             n_out_args,
                       GIArgument       *return_value,
                       GError          **error)
 {
diff --git a/girepository/givfuncinfo.h b/girepository/givfuncinfo.h
index 598064e96..f5bcc2d58 100644
--- a/girepository/givfuncinfo.h
+++ b/girepository/givfuncinfo.h
@@ -47,7 +47,7 @@ GI_AVAILABLE_IN_ALL
 GIVFuncInfoFlags  gi_vfunc_info_get_flags   (GIVFuncInfo *info);
 
 GI_AVAILABLE_IN_ALL
-gint              gi_vfunc_info_get_offset  (GIVFuncInfo *info);
+guint             gi_vfunc_info_get_offset  (GIVFuncInfo *info);
 
 GI_AVAILABLE_IN_ALL
 GISignalInfo *    gi_vfunc_info_get_signal  (GIVFuncInfo *info);
@@ -64,9 +64,9 @@ GI_AVAILABLE_IN_ALL
 gboolean          gi_vfunc_info_invoke      (GIVFuncInfo      *info,
                                              GType             implementor,
                                              const GIArgument *in_args,
-                                             int               n_in_args,
+                                             gsize             n_in_args,
                                              const GIArgument *out_args,
-                                             int               n_out_args,
+                                             gsize             n_out_args,
                                              GIArgument       *return_value,
                                              GError          **error);