diff --git a/cc3200/ftp/ftp.c b/cc3200/ftp/ftp.c
index 679c325613..ebf7861a92 100644
--- a/cc3200/ftp/ftp.c
+++ b/cc3200/ftp/ftp.c
@@ -932,6 +932,13 @@ static void ftp_close_cmd_data (void) {
     ftp_close_filesystem_on_error ();
 }
 
+static void stoupper (char *str) {
+    while (str && *str != '\0') {
+        *str = (char)unichar_toupper((int)(*str));
+        str++;
+    }
+}
+
 static ftp_cmd_index_t ftp_pop_command (char **str) {
     char _cmd[FTP_CMD_SIZE_MAX];
     ftp_pop_param (str, _cmd);
diff --git a/cc3200/main.c b/cc3200/main.c
index 06b3604b67..7c6c4b545d 100644
--- a/cc3200/main.c
+++ b/cc3200/main.c
@@ -98,13 +98,6 @@ int main (void) {
     for ( ; ; );
 }
 
-void stoupper (char *str) {
-    while (str && *str != '\0') {
-        *str = (char)toupper((int)(*str));
-        str++;
-    }
-}
-
 // We need this when configSUPPORT_STATIC_ALLOCATION is enabled
 void vApplicationGetIdleTaskMemory( StaticTask_t **ppxIdleTaskTCBBuffer,
                                     StackType_t **ppxIdleTaskStackBuffer,
diff --git a/cc3200/util/std.h b/cc3200/util/std.h
index a74c90e25a..6adcb94632 100644
--- a/cc3200/util/std.h
+++ b/cc3200/util/std.h
@@ -31,6 +31,3 @@ typedef unsigned int size_t;
 
 int printf(const char *fmt, ...);
 int snprintf(char *str, size_t size, const char *fmt, ...);
-
-// Convenience function, defined in main.c.
-void stoupper (char *str);