diff --git a/libavdevice/fbdev_common.c b/libavdevice/fbdev_common.c
index 47e7edde5c..2c70abb1f0 100644
--- a/libavdevice/fbdev_common.c
+++ b/libavdevice/fbdev_common.c
@@ -62,7 +62,7 @@ enum AVPixelFormat ff_get_pixfmt_from_fb_varinfo(struct fb_var_screeninfo *varin
     return AV_PIX_FMT_NONE;
 }
 
-const char* ff_fbdev_default_device()
+const char *ff_fbdev_default_device(void)
 {
     const char *dev = getenv("FRAMEBUFFER");
     if (!dev)