diff --git a/tests/testdisplay.c b/tests/testdisplay.c
index a4d6d186..4138f9fd 100644
--- a/tests/testdisplay.c
+++ b/tests/testdisplay.c
@@ -804,6 +804,7 @@ disable_planes(int fd)
 }
 #else
 static void enable_plane(struct connector *c) { return; }
+static void disable_planes(int fd) { return; }
 #endif
 
 static void