diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2ba1bc9f7..9e3a8500d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -70,11 +70,11 @@ set(LIB_SRC src/api-c.cpp
             src/MemoryPool.cpp
             src/PrimeGenerator.cpp
             src/nthPrime.cpp
-            src/nthPrimeApprox.cpp
             src/ParallelSieve.cpp
             src/popcount.cpp
             src/PreSieve.cpp
             src/PrimeSieve.cpp
+            src/RiemannR.cpp
             src/SievingPrimes.cpp)
 
 # Required includes ##################################################
diff --git a/include/primesieve/nthPrimeApprox.hpp b/include/primesieve/RiemannR.hpp
similarity index 93%
rename from include/primesieve/nthPrimeApprox.hpp
rename to include/primesieve/RiemannR.hpp
index 8c612494d..e99f10287 100644
--- a/include/primesieve/nthPrimeApprox.hpp
+++ b/include/primesieve/RiemannR.hpp
@@ -1,5 +1,5 @@
 ///
-/// @file  nthPrimeApprox.hpp
+/// @file  RiemannR.hpp
 ///
 /// Copyright (C) 2024 Kim Walisch, <kim.walisch@gmail.com>
 ///
diff --git a/src/nthPrimeApprox.cpp b/src/RiemannR.cpp
similarity index 99%
rename from src/nthPrimeApprox.cpp
rename to src/RiemannR.cpp
index f85b2cf63..ea04c5368 100644
--- a/src/nthPrimeApprox.cpp
+++ b/src/RiemannR.cpp
@@ -1,5 +1,5 @@
 ///
-/// @file  nthPrimeApprox.cpp
+/// @file  RiemannR.cpp
 ///        This file contains an implementation of the Riemann R
 ///        function which is a very accurate approximation of
 ///        PrimePi(x). Note that this Riemann R implementation is
diff --git a/src/app/main.cpp b/src/app/main.cpp
index 8bf59f9d6..51113ff50 100644
--- a/src/app/main.cpp
+++ b/src/app/main.cpp
@@ -9,7 +9,7 @@
 ///
 
 #include <primesieve/ParallelSieve.hpp>
-#include <primesieve/nthPrimeApprox.hpp>
+#include <primesieve/RiemannR.hpp>
 #include <primesieve/Vector.hpp>
 #include "cmdoptions.hpp"
 
diff --git a/src/nthPrime.cpp b/src/nthPrime.cpp
index e25c173d7..6941a9b68 100644
--- a/src/nthPrime.cpp
+++ b/src/nthPrime.cpp
@@ -12,7 +12,7 @@
 #include <primesieve/macros.hpp>
 #include <primesieve/pmath.hpp>
 #include <primesieve/primesieve_error.hpp>
-#include <primesieve/nthPrimeApprox.hpp>
+#include <primesieve/RiemannR.hpp>
 
 #include <stdint.h>
 #include <algorithm>
diff --git a/test/Riemann_R.cpp b/test/Riemann_R.cpp
index 910852747..4dd19d52d 100644
--- a/test/Riemann_R.cpp
+++ b/test/Riemann_R.cpp
@@ -8,7 +8,7 @@
 /// file in the top level directory.
 ///
 
-#include <primesieve/nthPrimeApprox.hpp>
+#include <primesieve/RiemannR.hpp>
 
 #include <stdint.h>
 #include <iostream>