diff --git a/src/base/io/json/Json.cpp b/src/base/io/json/Json.cpp
index 48016665a..fb4c0e470 100644
--- a/src/base/io/json/Json.cpp
+++ b/src/base/io/json/Json.cpp
@@ -191,7 +191,7 @@ rapidjson::Value xmrig::Json::normalize(double value, bool zero)
 }
 
 
-bool xmrig::Json::convertOffset(std::ifstream& ifs, size_t offset, size_t& line, size_t& pos, std::vector<std::string>& s)
+bool xmrig::Json::convertOffset(std::istream& ifs, size_t offset, size_t& line, size_t& pos, std::vector<std::string>& s)
 {
     std::string prev_t;
     std::string t;
diff --git a/src/base/io/json/Json.h b/src/base/io/json/Json.h
index 7ceae5dd3..e6b772a17 100644
--- a/src/base/io/json/Json.h
+++ b/src/base/io/json/Json.h
@@ -58,7 +58,7 @@ public:
     static rapidjson::Value normalize(double value, bool zero);
 
 private:
-    static bool convertOffset(std::ifstream& ifs, size_t offset, size_t& line, size_t& pos, std::vector<std::string>& s);
+    static bool convertOffset(std::istream& ifs, size_t offset, size_t& line, size_t& pos, std::vector<std::string>& s);
 };