diff --git a/lib/curl_fnmatch.c b/lib/curl_fnmatch.c
index 0725ce2bd65423524062953b4b29155121190da1..ad4ec1871992df34c7f02a4d85c30caedd72a9b4 100644
--- a/lib/curl_fnmatch.c
+++ b/lib/curl_fnmatch.c
@@ -223,7 +223,7 @@ static int setcharset(unsigned char **p, unsigned char *charset)
       }
       else if(c == '\\') {
         c = *(++(*p));
-        if(isprint(c)) {
+        if(ISPRINT(c)) {
           charset[c] = 1;
           (*p)++;
         }