diff --git a/src/tool_getparam.c b/src/tool_getparam.c
index 89385af844..7a3f815dff 100644
--- a/src/tool_getparam.c
+++ b/src/tool_getparam.c
@@ -36,6 +36,7 @@
 #include "tool_main.h"
 #include "tool_stderr.h"
 #include "tool_help.h"
+#include "tool_strdup.h"
 #include "var.h"
 
 #define ALLOW_BLANK TRUE
@@ -69,13 +70,10 @@ static ParameterError getstrn(char **str, const char *val,
   if(!allowblank && !val[0])
     return PARAM_BLANK_STRING;
 
-  *str = curlx_malloc(len + 1);
+  *str = memdup0(val, len);
   if(!*str)
     return PARAM_NO_MEM;
 
-  memcpy(*str, val, len);
-  (*str)[len] = 0; /* null-terminate */
-
   return PARAM_OK;
 }