diff --git a/Voice.cpp b/Voice.cpp
index c16ddd4..6fddac1 100644
--- a/Voice.cpp
+++ b/Voice.cpp
@@ -65,7 +65,7 @@ CVoice::~CVoice()
 	for (std::vector<CDMRData*>::iterator it = m_data.begin(); it != m_data.end(); ++it)
 		delete *it;
 
-	for (std::map<std::string, CPositions*>::iterator it = m_positions.begin(); it != m_positions.end(); ++it)
+	for (std::unordered_map<std::string, CPositions*>::iterator it = m_positions.begin(); it != m_positions.end(); ++it)
 		delete it->second;
 
 	m_data.clear();
diff --git a/Voice.h b/Voice.h
index dff9ffd..c27aadb 100644
--- a/Voice.h
+++ b/Voice.h
@@ -27,7 +27,7 @@
 
 #include <string>
 #include <vector>
-#include <map>
+#include <unordered_map>
 
 enum VOICE_STATUS {
 	VS_NONE,
@@ -67,7 +67,7 @@ private:
 	unsigned int                           m_streamId;
 	unsigned int                           m_sent;
 	unsigned char*                         m_ambe;
-	std::map<std::string, CPositions*>     m_positions;
+	std::unordered_map<std::string, CPositions*> m_positions;
 	std::vector<CDMRData*>                 m_data;
 	std::vector<CDMRData*>::const_iterator m_it;