diff --git a/include/cppkafka/buffer.h b/include/cppkafka/buffer.h
index 9237cf7..43e71a7 100644
--- a/include/cppkafka/buffer.h
+++ b/include/cppkafka/buffer.h
@@ -152,7 +152,7 @@ public:
     /**
      * Output operator
      */
-    friend std::ostream& operator<<(std::ostream& output, const Buffer& rhs);
+    CPPKAFKA_API friend std::ostream& operator<<(std::ostream& output, const Buffer& rhs);
 private:
     const DataType* data_;
     size_t size_;
@@ -161,12 +161,12 @@ private:
 /**
  * Compares Buffer objects for equality 
  */
-bool operator==(const Buffer& lhs, const Buffer& rhs);
+CPPKAFKA_API bool operator==(const Buffer& lhs, const Buffer& rhs);
 
 /**
  * Compares Buffer objects for inequality 
  */
-bool operator!=(const Buffer& lhs, const Buffer& rhs);
+CPPKAFKA_API bool operator!=(const Buffer& lhs, const Buffer& rhs);
 
 } // cppkafka
 
diff --git a/include/cppkafka/error.h b/include/cppkafka/error.h
index 626bd46..91ceb19 100644
--- a/include/cppkafka/error.h
+++ b/include/cppkafka/error.h
@@ -75,7 +75,7 @@ public:
     /**
      * Writes this error's string representation into a stream
      */
-    friend std::ostream& operator<<(std::ostream& output, const Error& rhs);
+    CPPKAFKA_API friend std::ostream& operator<<(std::ostream& output, const Error& rhs);
 private:
     rd_kafka_resp_err_t error_;
 };
diff --git a/include/cppkafka/topic_partition.h b/include/cppkafka/topic_partition.h
index f9c41fd..97ddc91 100644
--- a/include/cppkafka/topic_partition.h
+++ b/include/cppkafka/topic_partition.h
@@ -130,7 +130,7 @@ public:
     /**
      * Print to a stream
      */
-    friend std::ostream& operator<<(std::ostream& output, const TopicPartition& rhs);
+    CPPKAFKA_API friend std::ostream& operator<<(std::ostream& output, const TopicPartition& rhs);
 private:
     std::string topic_;
     int partition_;