diff --git a/lib/mprintf.c b/lib/mprintf.c
index 46438d47d..a09450306 100644
--- a/lib/mprintf.c
+++ b/lib/mprintf.c
@@ -180,8 +180,6 @@ struct asprintf {
                    the output is not the complete data */
 };
 
-int curl_msprintf(char *buffer, const char *format, ...);
-
 static long dprintf_DollarString(char *input, char **end)
 {
   int number=0;
diff --git a/packages/OS400/ccsidcurl.c b/packages/OS400/ccsidcurl.c
index 9b91bd8b1..9694a345c 100644
--- a/packages/OS400/ccsidcurl.c
+++ b/packages/OS400/ccsidcurl.c
@@ -33,6 +33,7 @@
 #pragma enum(int)
 
 #include <curl/curl.h>
+#include <curl/mprintf.h>
 #include "urldata.h"
 #include "url.h"
 #include "getinfo.h"