diff --git a/src/serialize.h b/src/serialize.h
--- a/src/serialize.h
+++ b/src/serialize.h
@@ -25,6 +25,12 @@
 
 static const uint64_t MAX_SIZE = 0x02000000;
 
+/**
+ * Maximum amount of memory (in bytes) to allocate at once when deserializing
+ * vectors.
+ */
+static const unsigned int MAX_VECTOR_ALLOCATE = 5000000;
+
 /**
  * Dummy data type to identify deserializing constructors.
  *
@@ -866,7 +872,7 @@
     size_t i = 0;
     size_t nMid = 0;
     while (nMid < nSize) {
-        nMid += 5000000 / sizeof(T);
+        nMid += MAX_VECTOR_ALLOCATE / sizeof(T);
         if (nMid > nSize) {
             nMid = nSize;
         }
@@ -938,7 +944,7 @@
     size_t i = 0;
     size_t nMid = 0;
     while (nMid < nSize) {
-        nMid += 5000000 / sizeof(T);
+        nMid += MAX_VECTOR_ALLOCATE / sizeof(T);
         if (nMid > nSize) {
             nMid = nSize;
         }