diff --git a/girepository/gicallableinfo.c b/girepository/gicallableinfo.c
index d29641b1a..618ae2774 100644
--- a/girepository/gicallableinfo.c
+++ b/girepository/gicallableinfo.c
@@ -632,7 +632,7 @@ gi_callable_info_invoke (GICallableInfo    *info,
                          gpointer           function,
                          const GIArgument  *in_args,
                          gsize              n_in_args,
-                         const GIArgument  *out_args,
+                         GIArgument        *out_args,
                          gsize              n_out_args,
                          GIArgument        *return_value,
                          GError           **error)
diff --git a/girepository/gicallableinfo.h b/girepository/gicallableinfo.h
index 30bc000cb..64e2a3875 100644
--- a/girepository/gicallableinfo.h
+++ b/girepository/gicallableinfo.h
@@ -96,7 +96,7 @@ gboolean               gi_callable_info_invoke          (GICallableInfo    *info
                                                          gpointer           function,
                                                          const GIArgument  *in_args,
                                                          gsize              n_in_args,
-                                                         const GIArgument  *out_args,
+                                                         GIArgument        *out_args,
                                                          gsize              n_out_args,
                                                          GIArgument        *return_value,
                                                          GError           **error);
diff --git a/girepository/gifunctioninfo.c b/girepository/gifunctioninfo.c
index 1d782a901..d4fe5cf8a 100644
--- a/girepository/gifunctioninfo.c
+++ b/girepository/gifunctioninfo.c
@@ -267,7 +267,7 @@ gboolean
 gi_function_info_invoke (GIFunctionInfo    *info,
                          const GIArgument  *in_args,
                          gsize              n_in_args,
-                         const GIArgument  *out_args,
+                         GIArgument        *out_args,
                          gsize              n_out_args,
                          GIArgument        *return_value,
                          GError           **error)
diff --git a/girepository/gifunctioninfo.h b/girepository/gifunctioninfo.h
index d0ab0ec04..a6399df73 100644
--- a/girepository/gifunctioninfo.h
+++ b/girepository/gifunctioninfo.h
@@ -93,7 +93,7 @@ GI_AVAILABLE_IN_ALL
 gboolean              gi_function_info_invoke         (GIFunctionInfo    *info,
                                                        const GIArgument  *in_args,
                                                        gsize              n_in_args,
-                                                       const GIArgument  *out_args,
+                                                       GIArgument        *out_args,
                                                        gsize              n_out_args,
                                                        GIArgument        *return_value,
                                                        GError           **error);
diff --git a/girepository/givfuncinfo.c b/girepository/givfuncinfo.c
index cbf23fa1d..11d6c452e 100644
--- a/girepository/givfuncinfo.c
+++ b/girepository/givfuncinfo.c
@@ -342,7 +342,7 @@ gi_vfunc_info_invoke (GIVFuncInfo      *info,
                       GType             implementor,
                       const GIArgument *in_args,
                       gsize             n_in_args,
-                      const GIArgument *out_args,
+                      GIArgument       *out_args,
                       gsize             n_out_args,
                       GIArgument       *return_value,
                       GError          **error)
diff --git a/girepository/givfuncinfo.h b/girepository/givfuncinfo.h
index f5bcc2d58..cd0ed8ff1 100644
--- a/girepository/givfuncinfo.h
+++ b/girepository/givfuncinfo.h
@@ -65,7 +65,7 @@ gboolean          gi_vfunc_info_invoke      (GIVFuncInfo      *info,
                                              GType             implementor,
                                              const GIArgument *in_args,
                                              gsize             n_in_args,
-                                             const GIArgument *out_args,
+                                             GIArgument       *out_args,
                                              gsize             n_out_args,
                                              GIArgument       *return_value,
                                              GError          **error);