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-rw-r--r--pcap_io.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/pcap_io.h b/pcap_io.h
index 8eb503a..5d338bb 100644
--- a/pcap_io.h
+++ b/pcap_io.h
@@ -625,7 +625,7 @@ static inline void pcap_prepare_header(struct pcap_filehdr *hdr, uint32_t magic,
hdr->magic = magic;
hdr->version_major = swapped ? ___constant_swab16(PCAP_VERSION_MAJOR) : PCAP_VERSION_MAJOR;
hdr->version_minor = swapped ? ___constant_swab16(PCAP_VERSION_MINOR) : PCAP_VERSION_MINOR;
- hdr->thiszone = swapped ? ___constant_swab32(thiszone) : thiszone;
+ hdr->thiszone = swapped ? (int32_t) ___constant_swab32(thiszone) : thiszone;
hdr->sigfigs = 0;
hdr->snaplen = swapped ? ___constant_swab32(snaplen) : snaplen;
hdr->linktype = swapped ? ___constant_swab32(linktype) : linktype;