diff --git a/Changelog.rst b/Changelog.rst
index 605a882d..de969161 100644
--- a/Changelog.rst
+++ b/Changelog.rst
@@ -195,7 +195,7 @@ New features
 * Added cSHAKE128 and cSHAKE256 (of SHA-3 family). Thanks to Michael Schaffner.
 * GH#558: The flag RTLD_DEEPBIND passed to ``dlopen()`` is not well supported by
   `address sanitizers <https://github.com/google/sanitizers/issues/611>`_.
-  It is now possible to set the environment variable ``PYCRYPTDOME_DISABLE_DEEPBIND``
+  It is now possible to set the environment variable ``PYCRYPTODOME_DISABLE_DEEPBIND``
   to drop that flag and allow security testing.
 
 3.10.4 (25 September 2021)
diff --git a/lib/Crypto/Util/_raw_api.py b/lib/Crypto/Util/_raw_api.py
index e0065c3d..61d2e96a 100644
--- a/lib/Crypto/Util/_raw_api.py
+++ b/lib/Crypto/Util/_raw_api.py
@@ -99,7 +99,7 @@ def load_lib(name, cdecl):
         @cdecl, the C function declarations.
         """
 
-        if hasattr(ffi, "RTLD_DEEPBIND") and not os.getenv('PYCRYPTODOME_DISABLE_DEEPBIND'):
+        if hasattr(ffi, "RTLD_DEEPBIND") and os.getenv('PYCRYPTODOME_DISABLE_DEEPBIND') is None:
             lib = ffi.dlopen(name, ffi.RTLD_DEEPBIND)
         else:
             lib = ffi.dlopen(name)