diff --git a/src/corelib/json/qjsonparser.cpp b/src/corelib/json/qjsonparser.cpp
index c7b16d5ec9..a23741a85c 100644
--- a/src/corelib/json/qjsonparser.cpp
+++ b/src/corelib/json/qjsonparser.cpp
@@ -491,9 +491,10 @@ namespace {
                 memcpy(newValues, data, size*sizeof(QJsonPrivate::Value));
                 data = newValues;
             } else {
-                data = static_cast<QJsonPrivate::Value *>(realloc(data, alloc*sizeof(QJsonPrivate::Value)));
-                if (!data)
+                void *newValues = realloc(data, alloc * sizeof(QJsonPrivate::Value));
+                if (!newValues)
                     return false;
+                data = static_cast<QJsonPrivate::Value *>(newValues);
             }
             return true;
         }
diff --git a/src/corelib/json/qjsonparser_p.h b/src/corelib/json/qjsonparser_p.h
index 82a7899a51..b17d75fb3a 100644
--- a/src/corelib/json/qjsonparser_p.h
+++ b/src/corelib/json/qjsonparser_p.h
@@ -101,11 +101,12 @@ private:
     inline int reserveSpace(int space) {
         if (current + space >= dataLength) {
             dataLength = 2*dataLength + space;
-            data = (char *)realloc(data, dataLength);
-            if (!data) {
+            char *newData = (char *)realloc(data, dataLength);
+            if (!newData) {
                 lastError = QJsonParseError::DocumentTooLarge;
                 return -1;
             }
+            data = newData;
         }
         int pos = current;
         current += space;