4 files changed, 4 insertions, 0 deletions
diff --git a/wr/write-png.c b/wr/write-png.c
index 39bfcff..c8643a5 100644
--- a/wr/write-png.c
+++ b/wr/write-png.c
@@ -1,5 +1,6 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <stddef.h>
 #include <string.h>
 #include <errno.h>
 #include <png.h>
diff --git a/wr/write-ppm.c b/wr/write-ppm.c
index bd5a0f0..016f0ba 100644
--- a/wr/write-ppm.c
+++ b/wr/write-ppm.c
@@ -1,5 +1,6 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <stddef.h>
 #include <string.h>
 #include <errno.h>
 
diff --git a/wr/write-ps.c b/wr/write-ps.c
index adbf72a..261a092 100644
--- a/wr/write-ps.c
+++ b/wr/write-ps.c
@@ -1,5 +1,6 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <stddef.h>
 #include <string.h>
 #include <errno.h>
 #include <inttypes.h>
diff --git a/wr/write-tiff.c b/wr/write-tiff.c
index 9d4910e..29d0788 100644
--- a/wr/write-tiff.c
+++ b/wr/write-tiff.c
@@ -1,5 +1,6 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <stddef.h>
 #include <string.h>
 #include <inttypes.h>
 #include <tiffio.h>