diff --git a/sys/src/cmd/gzip/unzip.c b/sys/src/cmd/gzip/unzip.c
index 488a33065..cf197f6d6 100644
--- a/sys/src/cmd/gzip/unzip.c
+++ b/sys/src/cmd/gzip/unzip.c
@@ -657,6 +657,8 @@ trailer(Biobuf *bin, ZipHead *zh)
 {
 	if(zh->flags & ZTrailInfo){
 		zh->crc = get4(bin);
+		if(zh->crc == 0x08074b50)	/* thanks apple */
+			zh->crc = get4(bin);
 		zh->csize = get4(bin);
 		zh->uncsize = get4(bin);
 	}
diff --git a/sys/src/cmd/tapefs/zipfs.c b/sys/src/cmd/tapefs/zipfs.c
index a7279b2e0..40d022e96 100644
--- a/sys/src/cmd/tapefs/zipfs.c
+++ b/sys/src/cmd/tapefs/zipfs.c
@@ -304,6 +304,8 @@ trailer(Biobuf *bin, ZipHead *zh)
 {
 	if(zh->flags & ZTrailInfo){
 		zh->crc = get4(bin);
+		if(zh->crc == 0x08074b50)	/* thanks apple */
+			zh->crc = get4(bin);
 		zh->csize = get4(bin);
 		zh->uncsize = get4(bin);
 	}