diff --git a/base/applications/cmdutils/reg/import.c b/base/applications/cmdutils/reg/import.c
index f7f87939e2..e2a33cd53c 100644
--- a/base/applications/cmdutils/reg/import.c
+++ b/base/applications/cmdutils/reg/import.c
@@ -285,6 +285,12 @@ static BOOL parse_data_type(struct parser *parser, WCHAR **line)
 
             /* "hex(xx):" is special */
             val = wcstoul(*line, &end, 16);
+            /* We cannot handle more that 8 characters here, so return FALSE.
+             * Since errno is only implemented as a stub,
+             * we cannot depend upon it working correctly below. */
+            /* FIXME: This can be removed when errno is implemented. */
+            if ((ULONG)(end - *line) > 8)
+                return FALSE;
             if (*end != ')' || *(end + 1) != ':' || (val == ~0u && errno == ERANGE))
                 return FALSE;