diff --git a/deps/rzlib/deflate.c b/deps/rzlib/deflate.c
index 772d0b5aac..1238e61149 100644
--- a/deps/rzlib/deflate.c
+++ b/deps/rzlib/deflate.c
@@ -260,7 +260,7 @@ int ZEXPORT deflateInit2_(z_streamp strm, int level, int method, int windowBits,
     if (windowBits == 8) windowBits = 9;  /* until 256-byte window bug fixed */
     s = (deflate_state *) ZALLOC(strm, 1, sizeof(deflate_state));
     if (s == Z_NULL) return Z_MEM_ERROR;
-    strm->state = (struct internal_state_deflate*)s;
+    strm->state = (struct internal_state*)s;
     s->strm = strm;
 
     s->wrap = wrap;
diff --git a/deps/rzlib/gzguts.h b/deps/rzlib/gzguts.h
index f18f6e17f7..cb7352e2e4 100644
--- a/deps/rzlib/gzguts.h
+++ b/deps/rzlib/gzguts.h
@@ -160,6 +160,13 @@
 #define MODE_COPY 1      /* copy input directly */
 #define MODE_GZIP 2      /* decompress a gzip stream */
 
+struct gzFile_s
+{
+    unsigned have;
+    unsigned char *next;
+    z_off64_t pos;
+};
+
 /* internal gzip file state data structure */
 typedef struct {
         /* exposed contents for gzgetc() macro */