diff --git a/include/trick/ExternalApplication.hh b/include/trick/ExternalApplication.hh
index 3f133ea9..3e93930e 100644
--- a/include/trick/ExternalApplication.hh
+++ b/include/trick/ExternalApplication.hh
@@ -300,7 +300,7 @@ namespace Trick {
 
         /** alloc'd addresses to be deallocated during app destruction (currently only
         used by command_c_str) */
-        std::vector<void*> allocations;
+        std::vector<char*> allocations;
 
         private:
 
diff --git a/trick_source/sim_services/ExternalApplications/ExternalApplication.cpp b/trick_source/sim_services/ExternalApplications/ExternalApplication.cpp
index 5b631fff..2ffcbd1c 100644
--- a/trick_source/sim_services/ExternalApplications/ExternalApplication.cpp
+++ b/trick_source/sim_services/ExternalApplications/ExternalApplication.cpp
@@ -15,6 +15,8 @@
 #include "trick/variable_server_proto.h"
 #include "trick/env_proto.h"
 #include "trick/command_line_protos.h"
+#include "trick/MemoryManager.hh"
+extern Trick::MemoryManager* trick_MM;
 
 Trick::ExternalApplication::ExternalApplication() :
     command(std::string(env_get_var("TRICK_HOME") + std::string("/bin/"))) {
@@ -23,21 +25,23 @@ Trick::ExternalApplication::ExternalApplication() :
       width_set = x_set = y_set = auto_reconnect_set = false;
       
       // c_intf uses char *, we manage the memory here in external application
-      command_c_str = strdup(command.c_str());
-      allocations.push_back((void*)command_c_str);
+      command_c_str = (char*)trick_MM->declare_var("char", (command.size() + 1) );
+      strcpy(command_c_str, command.c_str());
+      allocations.push_back(command_c_str);
 }
 
 Trick::ExternalApplication::~ExternalApplication() {
-    for(std::vector<void*>::iterator it = allocations.begin(); it != allocations.end(); ++it) {
-        free(*it);
+    for(std::vector<char*>::iterator it = allocations.begin(); it != allocations.end(); ++it) {
+        trick_MM->delete_var(*it);
     }
     allocations.clear();
 }
 
 void Trick::ExternalApplication::set_startup_command(std::string in_command) {
     command = in_command;
-    command_c_str = strdup(in_command.c_str());
-    allocations.push_back((void *) command_c_str);
+    command_c_str = (char*)trick_MM->declare_var("char", (command.size() + 1) );
+    strcpy(command_c_str, command.c_str());
+    allocations.push_back((command_c_str));
 }
 
 std::string Trick::ExternalApplication::get_startup_command() {