Index: libint2/include/libint2/boys.h
===================================================================
--- libint2.orig/include/libint2/boys.h
+++ libint2/include/libint2/boys.h
@@ -1313,7 +1313,7 @@ namespace libint2 {
 
         // get memory
         void* result;
-        int status = posix_memalign(&result, std::max(sizeof(Real), 32ul), (mmax_ - mmin_ + 1) * cheb_table_nintervals * ORDERp1 * ORDERp1 * sizeof(Real));
+        int status = posix_memalign(&result, std::max(sizeof(Real), std::size_t(32)), (mmax_ - mmin_ + 1) * cheb_table_nintervals * ORDERp1 * ORDERp1 * sizeof(Real));
         if (status != 0) {
           if (status == EINVAL)
             throw std::logic_error(