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@@ -1225,7 +1225,7 @@ static WC_INLINE void build_addr(SOCKADDR_IN_T* addr, const char* peer,
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#ifndef TEST_IPV6
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/* peer could be in human readable form */
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- if ( ((size_t)peer != INADDR_ANY) && isalpha(peer[0])) {
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+ if ( ((size_t)peer != INADDR_ANY) && isalpha((unsigned char)peer[0])) {
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#ifdef WOLFSSL_USE_POPEN_HOST
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char host_ipaddr[4] = { 127, 0, 0, 1 };
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int found = 1;
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