diff --git a/src/mpdu.c b/src/mpdu.c
index eb141c75..844e61d5 100644
--- a/src/mpdu.c
+++ b/src/mpdu.c
@@ -623,7 +623,7 @@ const struct mmpdu_header *mpdu_validate(const uint8_t *frame, int len)
 	}
 }
 
-static size_t mmpdu_header_len(const struct mmpdu_header *mmpdu)
+size_t mmpdu_header_len(const struct mmpdu_header *mmpdu)
 {
 	return mmpdu->fc.order == 0 ? 24 : 28;
 }
diff --git a/src/mpdu.h b/src/mpdu.h
index 4cf08d00..f3f7e4cd 100644
--- a/src/mpdu.h
+++ b/src/mpdu.h
@@ -408,3 +408,4 @@ struct mmpdu_deauthentication {
 
 const struct mmpdu_header *mpdu_validate(const uint8_t *frame, int len);
 const void *mmpdu_body(const struct mmpdu_header *mpdu);
+size_t mmpdu_header_len(const struct mmpdu_header *mmpdu);