diff --git a/src/COMPRESS/dump_atom_gz.cpp b/src/COMPRESS/dump_atom_gz.cpp
index ccbc8ecb6d..dfd23e2b4a 100644
--- a/src/COMPRESS/dump_atom_gz.cpp
+++ b/src/COMPRESS/dump_atom_gz.cpp
@@ -17,7 +17,6 @@
 #include "update.h"
 
 #include <string.h>
-#include <zlib.h>
 
 using namespace LAMMPS_NS;
 
diff --git a/src/COMPRESS/dump_atom_gz.h b/src/COMPRESS/dump_atom_gz.h
index 3a91844de6..304d37c790 100644
--- a/src/COMPRESS/dump_atom_gz.h
+++ b/src/COMPRESS/dump_atom_gz.h
@@ -21,9 +21,7 @@ DumpStyle(atom/gz,DumpAtomGZ)
 #define LMP_DUMP_ATOM_GZ_H
 
 #include "dump_atom.h"
-
-// forward definition from zlib.h
-typedef struct gzFile_s *gzFile;
+#include <zlib.h>
 
 namespace LAMMPS_NS {
 
diff --git a/src/COMPRESS/dump_cfg_gz.cpp b/src/COMPRESS/dump_cfg_gz.cpp
index 0a5f1a6314..6f653e73ee 100644
--- a/src/COMPRESS/dump_cfg_gz.cpp
+++ b/src/COMPRESS/dump_cfg_gz.cpp
@@ -18,7 +18,6 @@
 #include "update.h"
 
 #include <string.h>
-#include <zlib.h>
 
 using namespace LAMMPS_NS;
 #define UNWRAPEXPAND 10.0
diff --git a/src/COMPRESS/dump_cfg_gz.h b/src/COMPRESS/dump_cfg_gz.h
index 3b15cc8b14..58d8f09df4 100644
--- a/src/COMPRESS/dump_cfg_gz.h
+++ b/src/COMPRESS/dump_cfg_gz.h
@@ -21,9 +21,7 @@ DumpStyle(cfg/gz,DumpCFGGZ)
 #define LMP_DUMP_CFG_GZ_H
 
 #include "dump_cfg.h"
-
-// forward definition from zlib.h
-typedef struct gzFile_s *gzFile;
+#include <zlib.h>
 
 namespace LAMMPS_NS {
 
diff --git a/src/COMPRESS/dump_custom_gz.cpp b/src/COMPRESS/dump_custom_gz.cpp
index 27ac968bed..fb7802399b 100644
--- a/src/COMPRESS/dump_custom_gz.cpp
+++ b/src/COMPRESS/dump_custom_gz.cpp
@@ -17,7 +17,6 @@
 #include "update.h"
 
 #include <string.h>
-#include <zlib.h>
 
 using namespace LAMMPS_NS;
 
diff --git a/src/COMPRESS/dump_custom_gz.h b/src/COMPRESS/dump_custom_gz.h
index 0d7fa96a0c..83cb6811ad 100644
--- a/src/COMPRESS/dump_custom_gz.h
+++ b/src/COMPRESS/dump_custom_gz.h
@@ -21,9 +21,7 @@ DumpStyle(custom/gz,DumpCustomGZ)
 #define LMP_DUMP_CUSTOM_GZ_H
 
 #include "dump_custom.h"
-
-// forward definition from zlib.h
-typedef struct gzFile_s *gzFile;
+#include <zlib.h>
 
 namespace LAMMPS_NS {
 
diff --git a/src/COMPRESS/dump_xyz_gz.cpp b/src/COMPRESS/dump_xyz_gz.cpp
index 0bf0f15209..1a4474cba2 100644
--- a/src/COMPRESS/dump_xyz_gz.cpp
+++ b/src/COMPRESS/dump_xyz_gz.cpp
@@ -17,7 +17,6 @@
 #include "update.h"
 
 #include <string.h>
-#include <zlib.h>
 
 using namespace LAMMPS_NS;
 
diff --git a/src/COMPRESS/dump_xyz_gz.h b/src/COMPRESS/dump_xyz_gz.h
index b647334395..cf2a4323c4 100644
--- a/src/COMPRESS/dump_xyz_gz.h
+++ b/src/COMPRESS/dump_xyz_gz.h
@@ -21,9 +21,7 @@ DumpStyle(xyz/gz,DumpXYZGZ)
 #define LMP_DUMP_XYZ_GZ_H
 
 #include "dump_xyz.h"
-
-// forward definition from zlib.h
-typedef struct gzFile_s *gzFile;
+#include <zlib.h>
 
 namespace LAMMPS_NS {