diff --git a/src/include/switch_core.h b/src/include/switch_core.h
index 5f852fd4eb..4607dc20e6 100644
--- a/src/include/switch_core.h
+++ b/src/include/switch_core.h
@@ -383,7 +383,7 @@ SWITCH_DECLARE(char *) switch_core_permanent_strdup(const char *todup);
   \param todup the string to duplicate
   \return a pointer to the newly duplicated string
 */
-SWITCH_DECLARE(char *) switch_core_session_strdup(switch_core_session_t *session, char *todup);
+SWITCH_DECLARE(char *) switch_core_session_strdup(switch_core_session_t *session, const char *todup);
 
 /*! 
   \brief Copy a string using memory allocation from a given pool
diff --git a/src/switch_core.c b/src/switch_core.c
index c4187b459b..c6b31f4b1b 100644
--- a/src/switch_core.c
+++ b/src/switch_core.c
@@ -1466,7 +1466,7 @@ SWITCH_DECLARE(char *) switch_core_permanent_strdup(const char *todup)
 }
 
 
-SWITCH_DECLARE(char *) switch_core_session_strdup(switch_core_session_t *session, char *todup)
+SWITCH_DECLARE(char *) switch_core_session_strdup(switch_core_session_t *session, const char *todup)
 {
 	char *duped = NULL;
 	switch_size_t len;