diff --git a/src/resourcefiles/resourcefile.cpp b/src/resourcefiles/resourcefile.cpp
index 17c7e87391..adb484d32c 100644
--- a/src/resourcefiles/resourcefile.cpp
+++ b/src/resourcefiles/resourcefile.cpp
@@ -34,6 +34,7 @@
 **
 */
 
+#include <zlib.h>
 #include "resourcefile.h"
 #include "cmdlib.h"
 #include "w_wad.h"
diff --git a/src/serializer.cpp b/src/serializer.cpp
index c41fec1f37..75f96d581b 100644
--- a/src/serializer.cpp
+++ b/src/serializer.cpp
@@ -37,6 +37,7 @@
 #define RAPIDJSON_HAS_CXX11_RANGE_FOR 1
 #define RAPIDJSON_PARSE_DEFAULT_FLAGS kParseFullPrecisionFlag
 
+#include <zlib.h>
 #include "rapidjson/rapidjson.h"
 #include "rapidjson/writer.h"
 #include "rapidjson/prettywriter.h"
diff --git a/src/sound/i_music.cpp b/src/sound/i_music.cpp
index e93ba1b091..273ddb1152 100644
--- a/src/sound/i_music.cpp
+++ b/src/sound/i_music.cpp
@@ -45,6 +45,7 @@
 #include <ctype.h>
 #include <assert.h>
 #include <stdio.h>
+#include <zlib.h>
 
 #include "i_musicinterns.h"
 #include "doomtype.h"
diff --git a/src/sound/timiditypp/configfile.cpp b/src/sound/timiditypp/configfile.cpp
index 4d728f5ed1..1344a9cd6c 100644
--- a/src/sound/timiditypp/configfile.cpp
+++ b/src/sound/timiditypp/configfile.cpp
@@ -20,6 +20,7 @@ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 
 #include <stdio.h>
 #include <string.h>
+#include <stdint.h>
 
 #include <time.h>
 
diff --git a/src/sound/timiditypp/sfitem.cpp b/src/sound/timiditypp/sfitem.cpp
index 1e2173c1d5..fc7d55e691 100644
--- a/src/sound/timiditypp/sfitem.cpp
+++ b/src/sound/timiditypp/sfitem.cpp
@@ -24,6 +24,7 @@
  *================================================================*/
 
 #include <stdio.h>
+#include <stdint.h>
 #include "timidity.h"
 #include "common.h"
 #include "sflayer.h"
@@ -95,4 +96,4 @@ const LayerItem static_layer_items[SF_EOF] = {
 	{L_OVWRT, T_NOCONV, 0, 127, -1}, /* rootKey */
 };
 
-}
\ No newline at end of file
+}