diff --git a/include/graphblas/base/config.hpp b/include/graphblas/base/config.hpp
index f7796c852..787e087e8 100644
--- a/include/graphblas/base/config.hpp
+++ b/include/graphblas/base/config.hpp
@@ -33,6 +33,7 @@
 
 #include <assert.h>
 #include <unistd.h> //sysconf
+#include <cstdint> // for uintptr_t
 
 #include <graphblas/backends.hpp>
 
diff --git a/include/graphblas/bsp1d/io.hpp b/include/graphblas/bsp1d/io.hpp
index 9d6fae34e..d181ca0f3 100644
--- a/include/graphblas/bsp1d/io.hpp
+++ b/include/graphblas/bsp1d/io.hpp
@@ -1351,8 +1351,8 @@ namespace grb {
 			// a pipeline depth of 2 is sufficient.
 			constexpr size_t iteration_overlaps = 2;
 
-			const std::unique_ptr< size_t > first_nnz_per_thread(
-				new size_t[ num_threads * iteration_overlaps ]()
+			const std::unique_ptr< size_t[] > first_nnz_per_thread(
+				new size_t[ num_threads * iteration_overlaps ]
 			);
 			size_t * const first_nnz_per_thread_ptr = first_nnz_per_thread.get();
 			outgoing.resize( data.P );
diff --git a/include/graphblas/hyperdags/hyperdags.hpp b/include/graphblas/hyperdags/hyperdags.hpp
index 4ef0e0059..f637e2563 100644
--- a/include/graphblas/hyperdags/hyperdags.hpp
+++ b/include/graphblas/hyperdags/hyperdags.hpp
@@ -33,6 +33,7 @@
 #include <ostream>
 #include <iostream>
 #include <type_traits>
+#include <cstdint>
 
 #include <assert.h>
 
diff --git a/include/graphblas/reference/coordinates.hpp b/include/graphblas/reference/coordinates.hpp
index 59ea0326f..56f8935ff 100644
--- a/include/graphblas/reference/coordinates.hpp
+++ b/include/graphblas/reference/coordinates.hpp
@@ -25,6 +25,7 @@
 
 #include <stddef.h> //size_t
 
+#include <cstdint>
 #include <stdexcept> //std::runtime_error
 
 #include <assert.h>
diff --git a/include/graphblas/reference/init.hpp b/include/graphblas/reference/init.hpp
index 9332c8b88..fb1393988 100644
--- a/include/graphblas/reference/init.hpp
+++ b/include/graphblas/reference/init.hpp
@@ -24,6 +24,7 @@
 #define _H_GRB_REFERENCE_INIT
 
 #include <new>
+#include <cstdint>
 #include <algorithm>
 
 #include <graphblas/base/init.hpp>
diff --git a/tests/unit/parser.cpp b/tests/unit/parser.cpp
index c484ae8cc..97bb51e23 100644
--- a/tests/unit/parser.cpp
+++ b/tests/unit/parser.cpp
@@ -21,6 +21,7 @@
 #include <map>
 #include <sstream>
 #include <stdexcept>
+#include <cstdint>
 
 #include "graphblas/synchronizedNonzeroIterator.hpp"