diff --git a/src/crypto_digest.c b/src/crypto_digest.c
index 8f40dc8..16f1a93 100644
--- a/src/crypto_digest.c
+++ b/src/crypto_digest.c
@@ -93,7 +93,10 @@ uint8_t apk_digest_from_blob(struct apk_digest *d, apk_blob_t b)
 
 int apk_digest_calc(struct apk_digest *d, uint8_t alg, const void *ptr, size_t sz)
 {
-	union digest_state state;
+	union {
+		br_sha1_context sha1;
+		br_md5_context md5;
+	} state;
 
 	switch (alg) {
 	case APK_DIGEST_SHA256: