diff --git a/CHANGELOG.md b/CHANGELOG.md
index c59668c..55dd478 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -23,13 +23,15 @@ The rules for this file:
 - tylerjereddy
 - IAlibay
 - orbeckst
+- chr-sa
 
 ### Added
 <!-- Added functionality -->
 
 ### Fixed
+- Fix "NameError" for "long" in mdaencore/clustering/affinityprop.pyx (#72, PR #78)
 - All dependencies added to pyproject.toml, setup.py, and conda envs (#57)
-- Temporary fix for Windows integer size default change in NumPy 2.0.0
+- Temporary fix for Windows integer size default change in NumPy 2.0.0 (PR #60)
 
 ### Changed
 - Update CI and wheel deployment to include macos-arm64 and py3.12 (PR #63)
diff --git a/mdaencore/clustering/affinityprop.pyx b/mdaencore/clustering/affinityprop.pyx
index fe14206..4051403 100644
--- a/mdaencore/clustering/affinityprop.pyx
+++ b/mdaencore/clustering/affinityprop.pyx
@@ -96,7 +96,7 @@ def AffinityPropagation(s, preference, float lam, int max_iterations, int conver
 
     # Prepare input and ouput arrays
     cdef numpy.ndarray[numpy.float32_t,  ndim=1] matndarray = numpy.ascontiguousarray(s._elements, dtype=numpy.float32)
-    cdef numpy.ndarray[long,   ndim=1] clusters   = numpy.zeros((s.size),dtype=numpy.dtype("long"))
+    cdef numpy.ndarray[numpy.int64_t,   ndim=1] clusters   = numpy.zeros((s.size),dtype=numpy.int64)
 
     # run C module Affinity Propagation
     iterations = CAffinityPropagation(<float*>matndarray.data, cn, lam, max_iterations, convergence, noise, <long*>clusters.data)