diff --git a/src/libnm-glib-aux/nm-shared-utils.c b/src/libnm-glib-aux/nm-shared-utils.c
index d9928e324e..eb907445dd 100644
--- a/src/libnm-glib-aux/nm-shared-utils.c
+++ b/src/libnm-glib-aux/nm-shared-utils.c
@@ -5080,12 +5080,12 @@ nm_g_unix_signal_source_new(int            signum,
 }
 
 GSource *
-nm_g_unix_fd_source_new(int          fd,
-                        GIOCondition io_condition,
-                        int          priority,
-                        gboolean (*source_func)(int fd, GIOCondition condition, gpointer user_data),
-                        gpointer       user_data,
-                        GDestroyNotify destroy_notify)
+nm_g_unix_fd_source_new(int               fd,
+                        GIOCondition      io_condition,
+                        int               priority,
+                        GUnixFDSourceFunc source_func,
+                        gpointer          user_data,
+                        GDestroyNotify    destroy_notify)
 {
     GSource *source;
 
diff --git a/src/libnm-glib-aux/nm-shared-utils.h b/src/libnm-glib-aux/nm-shared-utils.h
index d5894e82a6..1f2cc53c21 100644
--- a/src/libnm-glib-aux/nm-shared-utils.h
+++ b/src/libnm-glib-aux/nm-shared-utils.h
@@ -1715,13 +1715,13 @@ GSource *nm_g_timeout_source_new_seconds(guint          timeout_sec,
                                          gpointer       user_data,
                                          GDestroyNotify destroy_notify);
 
-GSource *
-         nm_g_unix_fd_source_new(int          fd,
-                                 GIOCondition io_condition,
-                                 int          priority,
-                                 gboolean (*source_func)(int fd, GIOCondition condition, gpointer user_data),
-                                 gpointer       user_data,
-                                 GDestroyNotify destroy_notify);
+GSource *nm_g_unix_fd_source_new(int               fd,
+                                 GIOCondition      io_condition,
+                                 int               priority,
+                                 GUnixFDSourceFunc source_func,
+                                 gpointer          user_data,
+                                 GDestroyNotify    destroy_notify);
+
 GSource *nm_g_unix_signal_source_new(int            signum,
                                      int            priority,
                                      GSourceFunc    handler,