Index: build/cbindgen/tests/tests.rs
===================================================================
--- cbindgen/tests/tests.rs
+++ cbindgen/tests/tests.rs
@@ -71,7 +71,7 @@ fn compile(
     let cc = match language {
         Language::Cxx => env::var("CXX").unwrap_or_else(|_| "g++".to_owned()),
         Language::C => env::var("CC").unwrap_or_else(|_| "gcc".to_owned()),
-        Language::Cython => env::var("CYTHON").unwrap_or_else(|_| "cython".to_owned()),
+        Language::Cython => env::var("CYTHON").unwrap_or_else(|_| "cython3".to_owned()),
     };
 
     let file_name = cbindgen_output