diff --git a/src/not_implemented_yet.jl b/src/not_implemented_yet.jl
index 45e23ef55..4e8cb8208 100644
--- a/src/not_implemented_yet.jl
+++ b/src/not_implemented_yet.jl
@@ -3,7 +3,4 @@
 # Some of them may have implementations in LibGEOS which we can use
 # via an extension, but there is no native-Julia implementation for them.
 
-function symdifference end
-function buffer end
-function convexhull end
-function concavehull end
\ No newline at end of file
+function symdifference end
\ No newline at end of file