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-rw-r--r--posix/regex.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/posix/regex.c b/posix/regex.c
index bf0e7c46cc..626244f662 100644
--- a/posix/regex.c
+++ b/posix/regex.c
@@ -2168,7 +2168,7 @@ regex_compile (pattern, size, syntax, bufp)
for (;;)
{
PATFETCH (c);
- if (c == ':' || c == ']' || p == pend
+ if (c == ':' || c == ']' || !isalpha (c) || p == pend
|| c1 == CHAR_CLASS_MAX_LENGTH)
break;
str[c1++] = c;