diff --git a/deps/rzlib/gzclose.c b/deps/rzlib/gzclose.c
index 023d2a6501..05aff3b04c 100644
--- a/deps/rzlib/gzclose.c
+++ b/deps/rzlib/gzclose.c
@@ -5,10 +5,13 @@
 
 #include "gzguts.h"
 
+extern int gzclose_w(gzFile file);
+extern int gzclose_r(gzFile file);
+
 /* gzclose() is in a separate file so that it is linked in only if it is used.
    That way the other gzclose functions can be used instead to avoid linking in
    unneeded compression or decompression routines. */
-int ZEXPORT gzclose(gzFile file)
+int gzclose(gzFile file)
 {
 #ifndef NO_GZCOMPRESS
     gz_statep state;
diff --git a/deps/rzlib/gzread.c b/deps/rzlib/gzread.c
index cf772a46c4..278fc0b48f 100644
--- a/deps/rzlib/gzread.c
+++ b/deps/rzlib/gzread.c
@@ -544,7 +544,7 @@ int ZEXPORT gzdirect(gzFile file)
 }
 
 /* -- see zlib.h -- */
-int ZEXPORT gzclose_r(gzFile file)
+int gzclose_r(gzFile file)
 {
     int ret, err;
     gz_statep state;
diff --git a/deps/rzlib/gzwrite.c b/deps/rzlib/gzwrite.c
index 9ee2af66e9..25e058c001 100644
--- a/deps/rzlib/gzwrite.c
+++ b/deps/rzlib/gzwrite.c
@@ -515,7 +515,7 @@ int ZEXPORT gzsetparams(gzFile file, int level, int strategy)
 }
 
 /* -- see zlib.h -- */
-int ZEXPORT gzclose_w(gzFile file)
+int gzclose_w(gzFile file)
 {
     int ret = Z_OK;
     gz_statep state;