diff --git a/apps/errstr.c b/apps/errstr.c
index 782705a78a..21349d21cb 100644
--- a/apps/errstr.c
+++ b/apps/errstr.c
@@ -62,7 +62,7 @@ int errstr_main(int argc, char **argv)
     /* All remaining arg are error code. */
     ret = 0;
     for (argv = opt_rest(); *argv != NULL; argv++) {
-        if (sscanf(*argv, "%lx", &l) == 0) {
+        if (sscanf(*argv, "%lx", &l) <= 0) {
             ret++;
         } else {
             ERR_error_string_n(l, buf, sizeof(buf));
diff --git a/crypto/http/http_lib.c b/crypto/http/http_lib.c
index 3164d01d9e..cd0e25c85e 100644
--- a/crypto/http/http_lib.c
+++ b/crypto/http/http_lib.c
@@ -118,7 +118,7 @@ int OSSL_parse_url(const char *url, char **pscheme, char **puser, char **phost,
         port = ++p;
     /* remaining port spec handling is also done for the default values */
     /* make sure a decimal port number is given */
-    if (!sscanf(port, "%u", &portnum) || portnum > 65535) {
+    if (sscanf(port, "%u", &portnum) <= 0 || portnum > 65535) {
         ERR_raise_data(ERR_LIB_HTTP, HTTP_R_INVALID_PORT_NUMBER, "%s", port);
         goto err;
     }