diff --git a/scripts/build_ffi.py b/scripts/build_ffi.py
index ee07b1d..7a6779d 100644
--- a/scripts/build_ffi.py
+++ b/scripts/build_ffi.py
@@ -367,7 +367,7 @@ def get_features(local_wolfssl, features):
     features["WC_RNG_SEED_CB"] = 1 if '#define WC_RNG_SEED_CB' in defines else 0
     features["AESGCM_STREAM"] = 1 if '#define WOLFSSL_AESGCM_STREAM' in defines else 0
     features["RSA_PSS"] = 1 if '#define WC_RSA_PSS' in defines else 0
-    features["CHACHA20_POLY1305"] = 1 if '#define HAVE_CHACHA' & '#define HAVE_POLY1305' in defines else 0
+    features["CHACHA20_POLY1305"] = 1 if '#define HAVE_CHACHA' and '#define HAVE_POLY1305' in defines else 0
 
     if '#define HAVE_FIPS' in defines:
         if not fips: