diff --git a/app/config/gimpconfig-dump.c b/app/config/gimpconfig-dump.c
index ac9c334168..7afbf22303 100644
--- a/app/config/gimpconfig-dump.c
+++ b/app/config/gimpconfig-dump.c
@@ -29,6 +29,7 @@
 
 #ifdef G_OS_WIN32
 #include <io.h> /* get_osfhandle */
+#define fileno _fileno
 #include <gio/gwin32outputstream.h>
 #else
 #include <gio/gunixoutputstream.h>
diff --git a/app/core/gimp-utils.c b/app/core/gimp-utils.c
index e686b2e655..4744023e12 100644
--- a/app/core/gimp-utils.c
+++ b/app/core/gimp-utils.c
@@ -35,6 +35,7 @@
 #ifdef G_OS_WIN32
 #include <windows.h>
 #include <process.h>
+#define getpid _getpid
 #endif
 
 #include <cairo.h>
diff --git a/app/gui/gui-vtable.c b/app/gui/gui-vtable.c
index 74cecb07e3..df02186966 100644
--- a/app/gui/gui-vtable.c
+++ b/app/gui/gui-vtable.c
@@ -35,6 +35,8 @@
 #ifndef pipe
 #define pipe(fds) _pipe(fds, 4096, _O_BINARY)
 #endif
+#define read _read
+#define close _close
 #else
 #include <sys/types.h>
 #include <sys/wait.h>
diff --git a/app/tests/test-xcf.c b/app/tests/test-xcf.c
index 877d0b51b8..aa080703fe 100644
--- a/app/tests/test-xcf.c
+++ b/app/tests/test-xcf.c
@@ -28,6 +28,7 @@
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 #include <io.h>
+#define close _close
 #endif
 
 #include <gegl.h>
diff --git a/app/text/gimpfontfactory.c b/app/text/gimpfontfactory.c
index a685bc5c09..d6cf038117 100644
--- a/app/text/gimpfontfactory.c
+++ b/app/text/gimpfontfactory.c
@@ -25,6 +25,7 @@
 
 #ifdef _WIN32
 #include <io.h>
+#define read _read
 #endif
 
 #include <fcntl.h>
diff --git a/app/widgets/gimphelp.c b/app/widgets/gimphelp.c
index 27a5fbd681..bacfa4e283 100644
--- a/app/widgets/gimphelp.c
+++ b/app/widgets/gimphelp.c
@@ -22,6 +22,9 @@
 #include "config.h"
 
 #include <string.h>
+#ifdef _WIN32
+#define strdup _strdup
+#endif
 
 #include <gegl.h>
 #include <gtk/gtk.h>
diff --git a/libgimpthumb/gimpthumbnail.c b/libgimpthumb/gimpthumbnail.c
index 407c972a64..44b04bb655 100644
--- a/libgimpthumb/gimpthumbnail.c
+++ b/libgimpthumb/gimpthumbnail.c
@@ -40,7 +40,7 @@
 #ifdef G_OS_WIN32
 #include "libgimpbase/gimpwin32-io.h"
 #include <process.h>
-#define _getpid getpid
+#define getpid _getpid
 #endif
 
 #include "gimpthumb-types.h"
diff --git a/plug-ins/common/file-compressor.c b/plug-ins/common/file-compressor.c
index 28c83c3149..2a4c26a7b0 100644
--- a/plug-ins/common/file-compressor.c
+++ b/plug-ins/common/file-compressor.c
@@ -80,6 +80,8 @@
 #endif
 #ifdef _WIN32
 #include <io.h>
+#define close _close
+#define fileno _fileno
 #endif
 
 #include <glib/gstdio.h>
diff --git a/plug-ins/common/file-raw-data.c b/plug-ins/common/file-raw-data.c
index c78da9c59a..a212c93a5c 100644
--- a/plug-ins/common/file-raw-data.c
+++ b/plug-ins/common/file-raw-data.c
@@ -38,6 +38,9 @@
 
 #ifdef G_OS_WIN32
 #include <io.h>
+#define read _read
+#define close _close
+#define lseek _lseek
 #endif
 
 #include "libgimp/gimp.h"
diff --git a/plug-ins/file-faxg3/faxg3.c b/plug-ins/file-faxg3/faxg3.c
index 2742bcddf8..d6ed69aeeb 100644
--- a/plug-ins/file-faxg3/faxg3.c
+++ b/plug-ins/file-faxg3/faxg3.c
@@ -35,6 +35,9 @@
 
 #ifdef G_OS_WIN32
 #include <io.h>
+#define read _read
+#define close _close
+#define lseek _lseek
 #endif
 
 #ifndef _O_BINARY
diff --git a/plug-ins/imagemap/imap_cern_lex.c b/plug-ins/imagemap/imap_cern_lex.c
index 3803affeda..cdb1362957 100644
--- a/plug-ins/imagemap/imap_cern_lex.c
+++ b/plug-ins/imagemap/imap_cern_lex.c
@@ -628,6 +628,8 @@ char *cern_text;
 #endif
 #ifdef _WIN32
 #include <io.h>
+#define isatty _isatty
+#define fileno _fileno
 #endif
 
 #ifndef YY_EXTRA_TYPE
diff --git a/plug-ins/imagemap/imap_csim_lex.c b/plug-ins/imagemap/imap_csim_lex.c
index 7e508cd3bf..6fecdce089 100644
--- a/plug-ins/imagemap/imap_csim_lex.c
+++ b/plug-ins/imagemap/imap_csim_lex.c
@@ -653,6 +653,8 @@ char *csim_text;
 #endif
 #ifdef _WIN32
 #include <io.h>
+#define isatty _isatty
+#define fileno _fileno
 #endif
 
 #ifndef YY_EXTRA_TYPE
diff --git a/plug-ins/imagemap/imap_ncsa_lex.c b/plug-ins/imagemap/imap_ncsa_lex.c
index 1d2018c279..380b8388e2 100644
--- a/plug-ins/imagemap/imap_ncsa_lex.c
+++ b/plug-ins/imagemap/imap_ncsa_lex.c
@@ -593,6 +593,8 @@ char *ncsa_text;
 #endif
 #ifdef _WIN32
 #include <io.h>
+#define isatty _isatty
+#define fileno _fileno
 #endif
 
 #ifndef YY_EXTRA_TYPE
diff --git a/plug-ins/metadata/metadata-editor.c b/plug-ins/metadata/metadata-editor.c
index 53110e89d2..0595b8223d 100644
--- a/plug-ins/metadata/metadata-editor.c
+++ b/plug-ins/metadata/metadata-editor.c
@@ -22,6 +22,10 @@
 
 #include <stdlib.h>
 #include <ctype.h>
+#ifdef _WIN32
+#include <string.h>
+#define strdup _strdup
+#endif
 
 #include <gegl.h>
 #include <gtk/gtk.h>
diff --git a/plug-ins/script-fu/libscriptfu/ftx/ftx.c b/plug-ins/script-fu/libscriptfu/ftx/ftx.c
index cffbc82e2e..9ab6f74ae0 100644
--- a/plug-ins/script-fu/libscriptfu/ftx/ftx.c
+++ b/plug-ins/script-fu/libscriptfu/ftx/ftx.c
@@ -13,6 +13,10 @@
 #if HAVE_UNISTD_H
 #include <unistd.h>
 #endif
+#ifdef _WIN32
+#include <io.h>
+#define unlink _unlink
+#endif
 #include <time.h>
 
 #include <glib.h>
diff --git a/tools/gimp-test-clipboard.c b/tools/gimp-test-clipboard.c
index 974d3b70fa..d7b2fb7f26 100644
--- a/tools/gimp-test-clipboard.c
+++ b/tools/gimp-test-clipboard.c
@@ -21,6 +21,8 @@
 #include <io.h>
 #define popen  _popen
 #define pclose _pclose
+#define write _write
+#define close _close
 #endif
 
 #include <glib/gstdio.h>