diff --git a/include/rapidjson/allocators.h b/include/rapidjson/allocators.h
index d68b74c..16bf038 100644
--- a/include/rapidjson/allocators.h
+++ b/include/rapidjson/allocators.h
@@ -68,7 +68,14 @@ public:
         else
             return NULL; // standardize to returning NULL.
     }
-    void* Realloc(void* originalPtr, size_t originalSize, size_t newSize) { (void)originalSize; return std::realloc(originalPtr, newSize); }
+    void* Realloc(void* originalPtr, size_t originalSize, size_t newSize) {
+        (void)originalSize;
+        if (newSize == 0) {
+            std::free(originalPtr);
+            return NULL;
+        }
+        return std::realloc(originalPtr, newSize);
+    }
     static void Free(void *ptr) { std::free(ptr); }
 };
 
diff --git a/test/unittest/documenttest.cpp b/test/unittest/documenttest.cpp
index 71cd777..7e5d766 100644
--- a/test/unittest/documenttest.cpp
+++ b/test/unittest/documenttest.cpp
@@ -146,6 +146,7 @@ TEST(Document, ParseStream_EncodedInputStream) {
         StringBuffer bos2;
         Writer<StringBuffer> writer(bos2);
         reader.Parse(is, writer);
+        fclose(fp);
 
         EXPECT_EQ(bos.GetSize(), bos2.GetSize());
         EXPECT_EQ(0, memcmp(bos.GetString(), bos2.GetString(), bos2.GetSize()));
@@ -184,6 +185,7 @@ TEST(Document, ParseStream_AutoUTFInputStream) {
         StringBuffer bos2;
         Writer<StringBuffer> writer(bos2);
         reader.Parse(is, writer);
+        fclose(fp);
 
         EXPECT_EQ(bos.GetSize(), bos2.GetSize());
         EXPECT_EQ(0, memcmp(bos.GetString(), bos2.GetString(), bos2.GetSize()));