diff --git a/shared/nm-glib-aux/nm-macros-internal.h b/shared/nm-glib-aux/nm-macros-internal.h
index cbda66ac2c..45ca9475be 100644
--- a/shared/nm-glib-aux/nm-macros-internal.h
+++ b/shared/nm-glib-aux/nm-macros-internal.h
@@ -122,7 +122,7 @@ _nm_auto_free_gstring(GString **str)
 #define nm_auto_free_gstring nm_auto(_nm_auto_free_gstring)
 
 static inline void
-_nm_auto_protect_errno(int *p_saved_errno)
+_nm_auto_protect_errno(const int *p_saved_errno)
 {
     errno = *p_saved_errno;
 }