diff --git a/CMakeLists.txt b/CMakeLists.txt
index efcc8b70d..3194ac097 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -8,6 +8,10 @@ find_package(PythonInterp REQUIRED)
 find_package(PythonLibs REQUIRED)
 find_package(NumPy REQUIRED)
 
+if(APPLE)
+  SET(CMAKE_SHARED_LIBRARY_SUFFIX ".so")
+endif(APPLE)
+
 include_directories("${PYTHON_INCLUDE_DIRS}")
 include_directories("${NUMPY_INCLUDE_DIR}")
 
@@ -20,7 +24,7 @@ endif()
 set(ARROW_DIR "${CMAKE_SOURCE_DIR}/../arrow/" CACHE STRING
   "Path of the arrow source directory")
 
-set(ARROW_STATIC_LIB "${CMAKE_SOURCE_DIR}/../arrow/cpp/build/release/libarrow.so" CACHE STRING
+set(ARROW_STATIC_LIB "${CMAKE_SOURCE_DIR}/../arrow/cpp/build/release/libarrow.a" CACHE STRING
   "Path to libarrow.a (needs to be changed if arrow is build in debug mode)")
 
 include_directories("${ARROW_DIR}/cpp/src/")
diff --git a/python/src/pynumbuf/adapters/python.cc b/python/src/pynumbuf/adapters/python.cc
index 580c02f1d..7c747c4d9 100644
--- a/python/src/pynumbuf/adapters/python.cc
+++ b/python/src/pynumbuf/adapters/python.cc
@@ -61,7 +61,7 @@ Status append(PyObject* elem, SequenceBuilder& builder,
       return Status::NotImplemented("long overflow");
     }
   } else if (PyInt_Check(elem)) {
-    RETURN_NOT_OK(builder.Append(PyInt_AS_LONG(elem)));
+    RETURN_NOT_OK(builder.Append(static_cast<int64_t>(PyInt_AS_LONG(elem))));
   } else if (PyString_Check(elem)) {
     RETURN_NOT_OK(builder.Append(PyString_AS_STRING(elem), PyString_GET_SIZE(elem)));
   } else if (PyList_Check(elem)) {
@@ -95,7 +95,7 @@ Status SerializeSequences(std::vector<PyObject*> sequences, std::shared_ptr<Arra
   for (const auto& sequence : sequences) {
     PyObject* item;
     PyObject* iterator = PyObject_GetIter(sequence);
-    while (item = PyIter_Next(iterator)) {
+    while ((item = PyIter_Next(iterator))) {
       Status s = append(item, builder, sublists, subtuples, subdicts);
       Py_DECREF(item);
       // if an error occurs, we need to decrement the reference counts before returning