diff --git a/rott/rt_cfg.c b/rott/rt_cfg.c
index 1e71a9e..122a715 100644
--- a/rott/rt_cfg.c
+++ b/rott/rt_cfg.c
@@ -1851,7 +1851,7 @@ void GetAlternatePath (char * tokenstr, AlternateInformation *info)
    if (!stricmp (token, tokenstr))
       {
       GetTokenEOL (false);
-      info->path = strdup(name);
+      info->path = M_StringDuplicate(name);
       }
 }
 
@@ -1877,7 +1877,7 @@ void GetAlternateFile (char * tokenstr, AlternateInformation *info)
             {
             #if (SHAREWARE == 0)
             info->avail = true;
-            info->file = strdup(token);
+            info->file = M_StringDuplicate(token);
             #else
             printf("Alternate file %s ignored.\n",token);
             info->file = "";
diff --git a/rott/rt_main.c b/rott/rt_main.c
index a18a3a0..d726fc7 100644
--- a/rott/rt_main.c
+++ b/rott/rt_main.c
@@ -733,7 +733,7 @@ void SetupWads( void )
 			   }else{
 					fread(buf,3,3,f);//is the 3 first letters RTL (RTC)
 				    if (((strstr(buf,"RTL") != 0)||strstr(buf,"RTC") != 0)) {
-						GameLevels.file = strdup(tempstr);
+						GameLevels.file = M_StringDuplicate(tempstr);
 						GameLevels.avail++;
 						buf = safe_realloc(buf, 32 + strlen(tempstr));
 						strcpy (buf,"Adding ");
@@ -772,7 +772,7 @@ NoRTL:;
 			   }else{
 					fread(buf,3,3,f);//is the 3 first letters RTL (RTC)
 				    if (((strstr(buf,"RTL") != 0)||strstr(buf,"RTC") != 0)) {
-						BattleLevels.file = strdup(tempstr);
+						BattleLevels.file = M_StringDuplicate(tempstr);
 						BattleLevels.avail++;
 						buf = safe_realloc(buf, 32 + strlen(tempstr));
 						strcpy (buf,"Adding ");
@@ -836,7 +836,7 @@ NoRTC:;
       if (*src != '\\')
          strcat (tempstr,"\\\0");
       strcat (tempstr,RemoteSounds.file);
-      newargs [argnum++] = strdup(tempstr);
+      newargs [argnum++] = M_StringDuplicate(tempstr);
       }
    else
       {
diff --git a/rott/rt_ted.c b/rott/rt_ted.c
index 12aabf5..aa5724f 100644
--- a/rott/rt_ted.c
+++ b/rott/rt_ted.c
@@ -1648,7 +1648,7 @@ void GetMapFileName ( char * filename, size_t n )
 void SetBattleMapFileName ( char * filename )
 {
    BattleLevels.avail = true;
-   BattleLevels.file = strdup(filename);
+   BattleLevels.file = M_StringDuplicate(filename);
 }
 
 /*